Revert from Perl_malloc to Mymalloc for binary compatibility with
5.003.
#ifdef MYMALLOC
# ifdef HIDEMYMALLOC
-# define malloc Perl_malloc
-# define realloc Perl_realloc
-# define free Perl_free
-# define calloc Perl_calloc
+# define malloc Mymalloc
+# define realloc Myrealloc
+# define free Myfree
+# define calloc Mycalloc
# endif
# define safemalloc malloc
# define saferealloc realloc