stbi[_write]: support for UTF-8 names

actually already implemented by stbi so just enable it

Author: MartinPulec

src/main.c

@@ -52,7 +52,6 @@
 #else
     #define _T(...) __VA_ARGS__
     #define TCHAR char
-    #define _tfopen fopen
     #define _tcscmp strcmp
     #define _tcsstr strstr
 #endif

src/utils/image_delegate.c

@@ -64,6 +64,10 @@ enum {
 #pragma GCC diagnostic ignored "-Wunused-function"
 #endif
 
+#ifdef _WIN32
+#define STBI_WINDOWS_UTF8
+#define STBIW_WINDOWS_UTF8
+#endif
 static void
 gpujpeg_cuda_free_host(void* ptr);
 static void*