Attempted locale refactoring.  _LIBCPP_LOCALE__L_EXTENSIONS now should be defined if one has all of the xxx_l() functions.  I've defined this for apple, freebsd and win32.  _LIBCPP_HAS_DEFAULTRUNELOCALE should be defined if there is a _DefaultRuneLocale.  I've defined this for apple and freebsd.  The block of code we're trying to migrate away from is now under #ifdef __linux__.  I've tested only on OS X.  I hope I haven't broken things too badly elsewhere.  Please let me know.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@140734 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index 315cec9..a6f81db 100644
--- a/include/__config
+++ b/include/__config
@@ -309,8 +309,8 @@
 #define _LIBCPP_LOCALE__L_EXTENSIONS 1
 #endif
 
-#if __APPLE__ || _WIN32
-#define _LIBCPP_STABLE_APPLE_ABI
+#if __APPLE__ || __FreeBSD__
+#define _LIBCPP_HAS_DEFAULTRUNELOCALE
 #endif
 
 #if __APPLE__ || __FreeBSD__