mesa: remove the MALLOC, CALLOC and FREE macros

No longer used anywhere.  These also caused trouble in the Gallium
state tracker code where we include both core Mesa and Gallium util
headers (and the macros were defined differently in each world.)
Removing these macros should help avoid macro mix-ups in the future.

Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/main/imports.h

@@ -49,16 +49,10 @@ extern "C" {
 /** Memory macros */
 /*@{*/
 
-/** Allocate \p BYTES bytes */
-#define MALLOC(BYTES)      malloc(BYTES)
-/** Allocate and zero \p BYTES bytes */
-#define CALLOC(BYTES)      calloc(1, BYTES)
 /** Allocate a structure of type \p T */
 #define MALLOC_STRUCT(T)   (struct T *) malloc(sizeof(struct T))
 /** Allocate and zero a structure of type \p T */
 #define CALLOC_STRUCT(T)   (struct T *) calloc(1, sizeof(struct T))
-/** Free memory */
-#define FREE(PTR)          free(PTR)
 
 /*@}*/