Accepting IRIX 5.2's old-style getpwuid_r

[Alexandre Oliva]

Here's a patch to accept old-style getpwuid_r, that returns struct
passwd* instead of taking it by reference and returning int.  I'm
checking it in the branch and in mainline.  Hopefully, it's not too
late for 2.95.1.  There's just one more nit remaining for a clean
build on IRIX 5.2 (ctime_r has an additional argument).  I'm working
on it right now.  Hopefully, I'll have patience to fix a couple of
SunOS 4.1.3 problems too (the host in question is too slow)