unify include guard defines, __$FILENAME__

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

source/blender/blenlib/BLI_math_base.h

@@ -23,8 +23,8 @@
  * ***** END GPL LICENSE BLOCK *****
  * */
 
-#ifndef BLI_MATH_BASE_H
-#define BLI_MATH_BASE_H
+#ifndef __BLI_MATH_BASE_H__
+#define __BLI_MATH_BASE_H__
 
 /** \file BLI_math_base.h
  *  \ingroup bli
@@ -142,7 +142,7 @@
 #define CLAMP(a, b, c)		if((a)<(b)) (a)=(b); else if((a)>(c)) (a)=(c)
 #endif
 
-#ifdef BLI_MATH_INLINE_H
+#ifdef __BLI_MATH_INLINE_H__
 #include "intern/math_base_inline.c"
 #endif
 
@@ -181,5 +181,5 @@ extern double round(double x);
 
 double double_round(double x, int ndigits);
 
-#endif /* BLI_MATH_BASE_H */
+#endif /* __BLI_MATH_BASE_H__ */