Remove unneeded definition for NULL

NULL is already defined in stddef.h,
so a local definition is not be needed.

Signed-off-by: Stefan Weil <[email protected]>

Author: stweil

ccutil/host.h

@@ -140,10 +140,6 @@ typedef unsigned char BOOL8;
 #define FALSE           0
 #endif
 
-#ifndef NULL
-#define NULL            0L
-#endif
-
 // Return true if x is within tolerance of y
 template<class T> bool NearlyEqual(T x, T y, T tolerance) {
   T diff = x - y;