Bug: __WINT_TYPE__ and wint_t reference to different types

__WINT_TYPE__ type provided by gcc. It references to unsigned int
type for android and linux. Patch corrects wint_t typedef to
__WINT_TYPE__.

Signed-off-by: Sergey Melnikov <sergey.melnikov@intel.com>
Change-Id: Iabeb9fcb0b7bb303a8b220043e339126f125dd68
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index b46985b..ef88e04 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -45,7 +45,7 @@
 
 __BEGIN_DECLS
 
-typedef int                     wint_t;
+typedef __WINT_TYPE__           wint_t;
 typedef struct { int  dummy; }  mbstate_t;
 
 typedef enum {