Add bmake compatibility code

In bsd make $* only contains the directory of the file if it's run in
compatability mode. This breaks with Moose's use of the xs/ directory.

Changes

@@ -8,6 +8,11 @@ for, noteworthy changes.
   - Moose::Manual::Construction now notes that roles can modify the BUILD sub.
     (thanks, E. Choroba!)
 
+  [OTHER]
+
+  - adjustments have been made to the Makefile for 'bmake', so it now works
+    when not run in compatibility mode (Leon Timmermans).
+
 2.2010   2018-02-16
 
   [OTHER]

inc/MMHelper.pm

@@ -52,6 +52,23 @@ package MY;
 
 use Config;
 
+# These two are necessary to keep bmake happy
+sub xs_c {
+    my $self = shift;
+    my $ret = $self->SUPER::xs_c(@_);
+    $ret =~ s/\$\*\.xs/\$</g;
+    $ret =~ s/\$\*\.c\b/\$@/g;
+    return $ret;
+}
+
+sub c_o {
+    my $self = shift;
+    my $ret = $self->SUPER::c_o(@_);
+    $ret =~ s/\$\*\.c\b/\$</g;
+    $ret =~ s/\$\*\$\(OBJ_EXT\)/\$@/g;
+    return $ret;
+}
+
 sub const_cccmd {
     my $ret = shift->SUPER::const_cccmd(@_);
     return q{} unless $ret;