fix parallel installs in include/ dirs

This is for http://oss.sgi.com/bugzilla/show_bug.cgi?id=759
"fix parallel issue with include/ symlinks"

Doing something like "make -j2 install install-dev" would lead
to a race of removing & creating symlinks in include/

Thanks to Mike for reporting & suggesting the fix.

Reported-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
1 file changed