SDL_config_os2.h: remove duplicated HAVE_WCSL* defines.

(cherry picked from commit 6825a4aabb9ad40a3689c0561fb61591061a7395)

include/SDL_config_os2.h

@@ -114,9 +114,6 @@
 #define HAVE_MEMCPY 1
 #define HAVE_MEMMOVE 1
 #define HAVE_MEMCMP 1
-#define HAVE_WCSLEN 1
-#define HAVE_WCSLCPY 1
-#define HAVE_WCSLCAT 1
 #define HAVE_WCSCMP 1
 #define HAVE__WCSICMP 1
 #define HAVE__WCSNICMP 1