Fix build with --with-included-glib on Darwin

[Rudá Moura]

This proposed patch correctly build pkg-config with option
--with-included-glib enabled on Darwin.

Darwin (OS X) requires Carbon and CoreFoundation frameworks linked,
otherwise
there will be missing symbols:

Undefined symbols for architecture x86_64:
  "_CFRelease", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_CFStringGetCString", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_CFStringGetCStringPtr", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_CFStringGetLength", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_CFURLCopyFileSystemPath", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_CFURLCreateFromFSRef", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_FSFindFolder", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o)
  "_kCFAllocatorSystemDefault", referenced from:
      _find_folder in libglib-2.0.a(libglib_2_0_la-gutils.o

-- 
Rudá Moura
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