ucspi-unix: endian issue

Hi, ucspi-unix' uid/gid parsing isn't endian clean, seen with
dietlibc/armeb:

unixserver.c:
 static int parseu(const char* str, unsigned* out, int base);

 static void use_uid(const char* str)
 {
   if (!str) usage("UID not found in environment.");
   if (!parseu(str, &opt_uid, 10)) usage("Invalid UID number");
 }

While out in parseu() is a pointer to unsigned, opt_uid is uid_t which
may be short, e.g. with dietlibc/arm.

Regards, Gerrit.