ROMReader.cpp: Fix compiling on non-Windows systems. (Regression from commit 12c9323.)

desmume/src/ROMReader.cpp

@@ -88,7 +88,12 @@ void* STDROMReaderInit(const char* filename)
 		return 0;
 #endif
 	
+#ifdef WIN32
 	FILE* inf = _wfopen(mbstowcs((std::string)filename).c_str(),L"rb");
+#else
+	FILE* inf = fopen(filename, "rb");
+#endif
+	
 	if(!inf) return NULL;
 
 	STDROMReaderData* ret = new STDROMReaderData();