Move non-portable pragmas to rubyspec.h

In the extension libraries in spec/ruby/optional/capi, do not care
about deprecated declarations.

spec/ruby/optional/capi/ext/array_spec.c

@@ -196,10 +196,6 @@ static VALUE copy_ary(RB_BLOCK_CALL_FUNC_ARGLIST(el, new_ary)) {
   return rb_ary_push(new_ary, el);
 }
 
-// Suppress deprecations warnings for rb_iterate(), we want to test it while it exists
-RBIMPL_WARNING_PUSH()
-RBIMPL_WARNING_IGNORED(-Wdeprecated-declarations)
-
 static VALUE array_spec_rb_iterate(VALUE self, VALUE ary) {
   VALUE new_ary = rb_ary_new();
 
@@ -255,8 +251,6 @@ static VALUE array_spec_rb_block_call_then_yield(VALUE self, VALUE obj) {
   return Qnil;
 }
 
-RBIMPL_WARNING_POP()
-
 static VALUE array_spec_rb_mem_clear(VALUE self, VALUE obj) {
   VALUE ary[1];
   ary[0] = obj;

spec/ruby/optional/capi/ext/encoding_spec.c

@@ -271,15 +271,12 @@ static VALUE encoding_spec_rb_enc_str_asciionly_p(VALUE self, VALUE str) {
   }
 }
 
-RBIMPL_WARNING_PUSH()
-RBIMPL_WARNING_IGNORED(-Wformat-security)
 static VALUE encoding_spec_rb_enc_raise(VALUE self, VALUE encoding, VALUE exception_class, VALUE format) {
   rb_encoding *e = rb_to_encoding(encoding);
   const char *f = RSTRING_PTR(format);
 
   rb_enc_raise(e, exception_class, "%s", f);
 }
-RBIMPL_WARNING_POP()
 
 static VALUE encoding_spec_rb_uv_to_utf8(VALUE self, VALUE buf, VALUE num) {
   int len = rb_uv_to_utf8(RSTRING_PTR(buf), NUM2INT(num));

spec/ruby/optional/capi/ext/object_spec.c

@@ -155,13 +155,9 @@ static VALUE object_specs_rb_obj_method(VALUE self, VALUE obj, VALUE method) {
 }
 
 #ifndef RUBY_VERSION_IS_3_2
-// Suppress deprecations warnings for rb_obj_taint(), we want to test it while it exists
-RBIMPL_WARNING_PUSH()
-RBIMPL_WARNING_IGNORED(-Wdeprecated-declarations)
 static VALUE object_spec_rb_obj_taint(VALUE self, VALUE obj) {
   return rb_obj_taint(obj);
 }
-RBIMPL_WARNING_POP()
 #endif
 
 static VALUE so_require(VALUE self) {

spec/ruby/optional/capi/ext/rubyspec.h

@@ -11,6 +11,29 @@
 # include <version.h>
 #endif
 
+/* copied from ext/-test-/cxxanyargs/cxxanyargs.cpp */
+#if 0 /* Ignore deprecation warnings */
+
+#elif defined(_MSC_VER)
+#pragma warning(disable : 4996)
+
+#elif defined(__INTEL_COMPILER)
+#pragma warning(disable : 1786)
+
+#elif defined(__clang__)
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+#elif defined(__SUNPRO_CC)
+#pragma error_messages (off,symdeprecated)
+
+#else
+// :FIXME: improve here for your compiler.
+
+#endif
+
 #ifndef RUBY_VERSION_MAJOR
 #define RUBY_VERSION_MAJOR RUBY_API_VERSION_MAJOR
 #define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR

spec/ruby/optional/capi/ext/string_spec.c

@@ -255,19 +255,13 @@ VALUE string_spec_rb_str_new5(VALUE self, VALUE str, VALUE ptr, VALUE len) {
 }
 
 #ifndef RUBY_VERSION_IS_3_2
-// Suppress deprecations warnings for rb_tainted_str_new(), we want to test it while it exists
-RBIMPL_WARNING_PUSH()
-RBIMPL_WARNING_IGNORED(-Wdeprecated-declarations)
-
 VALUE string_spec_rb_tainted_str_new(VALUE self, VALUE str, VALUE len) {
   return rb_tainted_str_new(RSTRING_PTR(str), FIX2INT(len));
 }
 
 VALUE string_spec_rb_tainted_str_new2(VALUE self, VALUE str) {
   return rb_tainted_str_new2(RSTRING_PTR(str));
 }
-
-RBIMPL_WARNING_POP()
 #endif
 
 VALUE string_spec_rb_str_plus(VALUE self, VALUE str1, VALUE str2) {

spec/ruby/optional/capi/ext/thread_spec.c

@@ -26,8 +26,6 @@ static VALUE thread_spec_rb_thread_alone(VALUE self) {
   return rb_thread_alone() ? Qtrue : Qfalse;
 }
 
-RBIMPL_WARNING_IGNORED(-Wdeprecated-declarations)
-
 /* This is unblocked by unblock_func(). */
 static void* blocking_gvl_func(void* data) {
   int rfd = *(int *)data;