fix mingw build failures in CI with clang-tidy.

(cherry-picked from commit a8a72de6fbcf9afe8a6e8760f31a79a0ed6fed1a)

include/SDL_stdinc.h

@@ -716,10 +716,19 @@ size_t strlcpy(char* dst, const char* src, size_t size);
 size_t strlcat(char* dst, const char* src, size_t size);
 #endif
 
+#ifndef HAVE_WCSLCPY
+size_t wcslcpy(wchar_t *dst, const wchar_t *src, size_t size);
+#endif
+
+#ifndef HAVE_WCSLCAT
+size_t wcslcat(wchar_t *dst, const wchar_t *src, size_t size);
+#endif
+
 /* Starting LLVM 16, the analyser errors out if these functions do not have
    their prototype defined (clang-diagnostic-implicit-function-declaration) */
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #define SDL_malloc malloc
 #define SDL_calloc calloc