Use what ever is the system default (with ulimit) or let user configure
in squid.conf

ref #2850

Tool to process C preprocessor #if and #ifdef directives
http://dotat.at/prog/unifdef/

fixes an annoying bug, and contains a required change for the
bgpd-implement-next-hop-self-all patch to work.

Useful in various situations. And practically counts as a bugfix
because the route-map set ip next-hop does not work for iBGP but
it should.

There are 2 different versions of basename and apparently the gnu
version from string.h segfault. We include libgen.h so we get the
posix version

rework the patches a bit

override to allow having /usr/local