Implement getcwd() for XNU

libc/calls/hefty/get_current_dir_name.c

@@ -32,7 +32,6 @@
  */
 nodiscard char *get_current_dir_name(void) {
   char *buf, *res;
-  if ((res = getenv("PWD"))) return strdup(res);
   if (!(buf = malloc(PATH_MAX))) return NULL;
   if (!(res = (getcwd)(buf, PATH_MAX))) free(buf);
   return res;