Put newline to end of m_perfstats.h

src/m_perfstats.h

@@ -39,4 +39,4 @@ void PS_SetThinkFrameHookInfo(int index, UINT32 time_taken, char* short_src);
 
 void M_DrawPerfStats(void);
 
-#endif
\ No newline at end of file
+#endif