Truncate the path on logging

Cmake compiles we an absolute path, so the macro __FILE__ also has the absolute file in it.
It seems that gcc doesn't provide macros for the basename, so we have to truncate them in c directly:
https://stackoverflow.com/questions/8487986/file-macro-shows-full-path

Source/Core/Common/LogManager.cpp

@@ -22,6 +22,19 @@
 void GenericLog(LogTypes::LOG_LEVELS level, LogTypes::LOG_TYPE type,
 		const char *file, int line, const char* fmt, ...)
 {
+#ifdef _WIN32
+	int delimiter = '\\';
+#else
+	int delimiter = '/';
+#endif
+	// The used macro __FILE__ differs between GCC and VS:
+	// GCC defines the full path, VS relative to the local project file.
+	// It would be the best to get the one relative to the project directory,
+	// but the full path is even worse, so just strip it to the filename itself.
+	const char* basefile = strrchr(file, delimiter);
+	if(basefile != nullptr)
+		file = basefile + 1;
+
 	va_list args;
 	va_start(args, fmt);
 	if (LogManager::GetInstance())