Replace long obsolete sub native trick

Ever since we got support for %?RESOURCES, there has not been a need for a
"native" sub containing logic to find the library. Perl 6 finds it for us :)

lib/Inline/Python.pm6

@@ -7,13 +7,7 @@ has &!call_method;
 
 use NativeCall;
 
-sub native(Sub $sub) {
-    my Str $path = %?RESOURCES<libraries/pyhelper>.Str;
-    unless $path {
-        die "unable to find pyhelper library";
-    }
-    trait_mod:<is>($sub, :native($path));
-}
+my constant $pyhelper = %?RESOURCES<libraries/pyhelper>.Str;
 
 class PythonObject { ... }
 role PythonParent { ... }
@@ -46,141 +40,141 @@ class ObjectKeeper {
 }
 
 sub py_init_python(&call_object (int32, Pointer, Pointer --> Pointer), &call_method (int32, Str, Pointer, Pointer --> Pointer))
+    is native($pyhelper)
     { ... }
-    native(&py_init_python);
 sub py_init_perl6object()
+    is native($pyhelper)
     { ... }
-    native(&py_init_perl6object);
 sub py_eval(Str, int32)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_eval);
 sub py_import(Str)
     returns Pointer
+    is native($pyhelper)
     { ... }
-    native(&py_import);
 sub py_instance_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_instance_check);
 sub py_is_instance(Pointer, Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_is_instance);
 sub py_int_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_int_check);
 sub py_float_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_float_check);
 sub py_unicode_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_unicode_check);
 sub py_ascii_string_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_ascii_string_check);
 sub py_string_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_string_check);
 sub py_sequence_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_sequence_check);
 sub py_mapping_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_mapping_check);
 sub py_callable_check(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_callable_check);
 sub py_is_none(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_is_none);
 sub py_int_as_long(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_int_as_long);
 sub py_int_to_py(int32)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_int_to_py);
 sub py_float_as_double(Pointer)
+    is native($pyhelper)
     returns num64 { ... }
-    native(&py_float_as_double);
 sub py_float_to_py(num64)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_float_to_py);
 sub py_unicode_as_utf8_string(Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_unicode_as_utf8_string);
 sub py_string_as_string(Pointer)
+    is native($pyhelper)
     returns Str { ... }
-    native(&py_string_as_string);
 sub py_string_to_buf(Pointer, CArray[CArray[int8]])
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_string_to_buf);
 sub py_str_to_py(int32, Str)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_str_to_py);
 sub py_buf_to_py(int32, Blob)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_buf_to_py);
 sub py_tuple_new(int32)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_tuple_new);
 sub py_tuple_set_item(Pointer, int32, Pointer)
+    is native($pyhelper)
     { ... }
-    native(&py_tuple_set_item);
 sub py_list_new(int32)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_list_new);
 sub py_list_set_item(Pointer, int32, Pointer)
+    is native($pyhelper)
     { ... }
-    native(&py_list_set_item);
 sub py_dict_new()
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_dict_new);
 sub py_dict_set_item(Pointer, Pointer, Pointer)
+    is native($pyhelper)
     { ... }
-    native(&py_dict_set_item);
 sub py_call_function(Str, Str, Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_call_function);
 sub py_call_function_kw(Str, Str, Pointer, Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_call_function_kw);
 sub py_call_static_method(Str, Str, Str, Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_call_static_method);
 sub py_call_static_method_kw(Str, Str, Str, Pointer, Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_call_static_method_kw);
 sub py_call_method(Pointer, Str, Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_call_method);
 sub py_call_method_kw(Pointer, Str, Pointer, Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_call_method_kw);
 sub py_sequence_length(Pointer)
+    is native($pyhelper)
     returns int32 { ... }
-    native(&py_sequence_length);
 sub py_sequence_get_item(Pointer, int32)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_sequence_get_item);
 sub py_mapping_items(Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_mapping_items);
 sub py_none()
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_none);
 sub py_dec_ref(Pointer)
+    is native($pyhelper)
     { ... }
-    native(&py_dec_ref);
 sub py_inc_ref(Pointer)
+    is native($pyhelper)
     { ... }
-    native(&py_inc_ref);
 sub py_getattr(Pointer, Str)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_getattr);
 sub py_dir(Pointer)
+    is native($pyhelper)
     returns Pointer { ... }
-    native(&py_dir);
 sub py_fetch_error(CArray[Pointer])
+    is native($pyhelper)
     { ... }
-    native(&py_fetch_error);
 
 method py_dec_ref(Pointer $obj) {
     py_dec_ref($obj);