Patch #588564: _locale library patch

This patch enables setup.py to find gettext routines when they are
located in libintl instead of libc.  Although I developed this patch for
Cygwin, I hope that it can be easily updated to support other platforms
(if necessary). I tested this patch under Cygwin and Red Hat Linux 7.1.

setup.py

@@ -302,7 +302,12 @@ class PyBuildExt(build_ext):
         if have_unicode:
             exts.append( Extension('unicodedata', ['unicodedata.c']) )
         # access to ISO C locale support
-        exts.append( Extension('_locale', ['_localemodule.c']) )
+        if platform in ['cygwin']:
+            locale_libs = ['intl']
+        else:
+            locale_libs = []
+        exts.append( Extension('_locale', ['_localemodule.c'],
+                               libraries=locale_libs ) )
 
         # Modules with some UNIX dependencies -- on by default:
         # (If you have a really backward UNIX, select and socket may not be