Fixed signed/unsigned mismatch ... hmm, limited to 2 GB reads? Fix in SDL 1.3

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402451

src/file/SDL_rwops.c

@@ -187,7 +187,7 @@ static int SDLCALL win32_file_read(SDL_RWops *context, void *ptr, int size, int
             SDL_Error(SDL_EFREAD);
             return 0;
         }
-        read_ahead = SDL_min(total_need, byte_read);
+        read_ahead = SDL_min(total_need, (int)byte_read);
         SDL_memcpy(ptr, context->hidden.win32io.buffer.data, read_ahead);
         context->hidden.win32io.buffer.size = byte_read;
         context->hidden.win32io.buffer.left = byte_read-read_ahead;