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getpwnam pathalogy

On Solaris, getpwnam() itself does not change errno in case of "no such user",
but if you make getpwnam() a wrapper around getpwnam_r() than you get
EINVAL.  Oh yes, you can get EBADF even easier but let's ignore this ;-)
Yes I know that this is very pathalogical case but let's remove
"#ifdef _osf_" in mailbox.c:

--- mailbox.c.orig      Wed Oct 27 21:20:06 1999
+++ mailbox.c   Mon Nov 22 18:39:33 1999
@@ -1156,12 +1156,10 @@
                 fine lookup -- to mark lack of data */
              if (errno == ENOENT)
                errno = 0;
-#ifdef __osf__
              /* ... and OSF/1 *must* be different, of course ...
                 (I just wonder what AIX does) */
              if (errno == EINVAL)
                errno = 0;
-#endif
              if (errno != 0) { /* getpwnam() failed for some other
                                   reason than simply not finding the
                                   given user... */