[Glide64] Add stdlib.h to Gfx_1.3.h

Source/Glide64/Gfx_1.3.h

@@ -66,6 +66,7 @@ the plugin
 
 #include <stdio.h>
 #include <fstream>
+#include <stdlib.h>
 #include <stddef.h>		// offsetof
 #include <glide.h>
 #include <Common/MemTest.h>
@@ -84,10 +85,6 @@ typedef unsigned char boolean;
 #define GLIDE64_CATCH catch (...)
 #endif
 
-#ifndef _WIN32
-typedef void* HWND;
-#endif
-
 #ifndef TEXTURE_FILTER
 typedef wxInt64 int64;
 typedef wxUint64 uint64;