Errno checks for rmtree()

The following patch adds appropriate error messages based on the errno
returned from rmtree() failures.

The original code came in this commit:

revision 1.13
date: 2004/08/01 06:19:26; author: momjian; state: Exp; lines: +173 -7
Add docs for initdb --auth.

which obviouisly had an inaccurate description. I am not even sure
where the rmtree() code came from, but I think it was Andrew Dunstan.

Anyway, it never had errno checks with messages, so we didn't strip it
out; rather it was never there. The original code did a
system("rmdir") call so this code was obviously superior.

Anyway, I will apply the attached patch to CVS HEAD and 8.0.X in a day
or so.

--
Bruce Momjian | http://candle.pha.pa.us
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