sim: punt zfree()

The sim keeps track of which allocations are zero-ed internally (via
zalloc) and then calls a helper "zfree" function rather than "free".
But this "zfree" function simply calls "free" itself.  Since I can
see no point in this and it is simply useless overhead, punt it.

The only real change is in hw-alloc.c where we remove the zalloc_p
tracking, and sim-utils.c where zfree is delete.  The rest of the
changes are a simple `sed` from "zfree" to "free".

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

sim/common/sim-utils.h

@@ -28,8 +28,6 @@ void *zalloc (unsigned long size);
 #define ZALLOC(TYPE) (TYPE*)zalloc(sizeof (TYPE))
 #define NZALLOC(TYPE,N) (TYPE*)zalloc(sizeof (TYPE) * (N))
 
-void zfree(void*);
-
 /* Turn VALUE into a string with commas.  */
 char *sim_add_commas (char *, int, unsigned long);