[PATCH] Add getmntent_r

This patch set implements getmntent_r, a GNU extension:

http://man7.org/linux/man-pages/man3/getmntent.3.html

libvirt needs this[1], as I just (re)discovered.  Patches for 
winsup/cygwin and winsup/doc attached.

Yaakov

[1] http://cygwin.com/ml/cygwin/2010-04/msg00885.html