Change Myrealloc to Myremalloc to conform to 5.003's version.
I left in the Mycalloc since malloc.c now includes a calloc,
and we might need to hide it.
#ifdef MYMALLOC
# ifdef HIDEMYMALLOC
# define malloc Mymalloc
-# define realloc Myrealloc
+# define realloc Myremalloc
# define free Myfree
# define calloc Mycalloc
# endif
#ifdef MYMALLOC
# ifdef HIDEMYMALLOC
# define malloc Mymalloc
-# define realloc Myrealloc
+# define realloc Myremalloc
# define free Myfree
# define calloc Mycalloc
# endif