Fix Linux GCC 4.9 build (complaining about undeclared memset)

src/video_core/debug_utils/debug_utils.cpp

@@ -4,9 +4,10 @@
 
 #include <algorithm>
 #include <condition_variable>
+#include <cstring>
+#include <fstream>
 #include <list>
 #include <map>
-#include <fstream>
 #include <mutex>
 #include <string>