Add devel/py-anyconfig

- Generic access to configuration files in many formats
- configuration merge / cascade / overlay support

Approved by:	    wg (mentor)
Yesterday's UPDATING entry mistakenly assumed that
compat.linux.osrelease=2.6.18 made it into 10.1-RELEASE,
while it's not even in 10-STABLE at this point.

Correct this by pointing out that all RELEASES should up/downgrade it.

Spotted by:	Piotr Kubaj <pkubaj@riseup.net>
Approved by:	swills (mentor)
print/pdflib: Make DragonFly respect Perl's LDDFLAGS too

This is required for upcoming Perl changes.  I just duplicated the FreeBSD
line as a case option rather than add two more patterns -- mainly for
consistency as each platform got their own line in other cases.

Follows:	r373971