#include <sys/stdtypes.h> before <stddef.h> so that when we compile

with GCC, the compiler does not stumble over `size_t', `ptrdiff_t',
and `wchar_t'.  Also note that the comment in <stddef.h> says that we
have to #include <sys/stdtypes.h> before including <stddef.h> when on
a sun.

gas/config/ho-sunos.h

@@ -9,6 +9,9 @@
 #else
 extern int memset();
 #endif
+
+/* #include <sys/stdtypes.h> before <stddef.h> when compiling by GCC.  */
+#include <sys/stdtypes.h>
 #include <stddef.h>
 #include <ctype.h>
 #include <string.h>