Clang defines wchar_t as int, gcc as long on the target. They have the same
size, but are different types. i386 already has this same change, do it for
powerpc as well.

--- arch/powerpc/bits/alltypes.h.in
+++ arch/powerpc/bits/alltypes.h.in
@@ -6,8 +6,12 @@ TYPEDEF __builtin_va_list va_list;
 TYPEDEF __builtin_va_list __isoc_va_list;
 
 #ifndef __cplusplus
+#ifdef __WCHAR_TYPE__
+TYPEDEF __WCHAR_TYPE__ wchar_t;
+#else
 TYPEDEF long wchar_t;
 #endif
+#endif
 
 TYPEDEF float float_t;
 TYPEDEF double double_t;