Revert "Use gcc to find places needing a a_tokenize call."

Not needed anymore.

This reverts commit 7b7af60dcd.

common/util.h

@@ -219,15 +219,6 @@ static inline int a_strcmp(const char *a, const char *b)
 {
     return strcmp(NONULL(a), NONULL(b));
 }
-#ifdef __GNUC__
-#define a_strcmp(a, b) \
-    ({                                                                              \
-        __builtin_choose_expr(__builtin_constant_p(a) || __builtin_constant_p(b),   \
-            (void)({__asm__(".warning \"you may want to use a_tokenize here\"");}), \
-            (void)0);                                                               \
-        (a_strcmp)((a), (b));                                                       \
-    })
-#endif
 
 /** \brief \c NULL resistant strcasecmp.
  * \param[in]  a     the first string.