Function movements

* string functions mstr*() are moved to string_utils.c
* allocation wrappers are moved to utils.h
* printf_* functions are moved to log.h

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/opengl.c

@@ -9,6 +9,7 @@
  *
  */
 
+#include "string_utils.h"
 #include "opengl.h"
 
 static inline int