unify include guard defines, __$FILENAME__

without the underscores these clogged up the namespace for autocompleation which was annoying.

source/blender/python/intern/bpy_util.h

@@ -25,8 +25,8 @@
  */
 
 
-#ifndef BPY_UTIL_H
-#define BPY_UTIL_H
+#ifndef __BPY_UTIL_H__
+#define __BPY_UTIL_H__
 
 #if PY_VERSION_HEX <  0x03020000
 #error "Python 3.2 or greater is required, you'll need to update your python."