efivar: update to 0.15.
efibootmgr: update to 0.11.0.
xbps-src: update-check: avoid bashism, requested by @chneukirchen.
xtools: update to 0.8.
stunnel: update to 5.07.
sbcl: update to 1.2.5.
pax-utils: don't fetch whole distfiles index for update check.
gnubg: update to 1.04.000.
gnubg: configure check needs python.
gnubg: needs gdk-pixbuf-devel tools.
gnubg: nocross=yes
tor: fix sv script. closes #613.
add update_* to most packages starting with "a".
update_check.sh: extract sourceforge project name from URL instead of guessing it.
add update_* to most packages starting with "b".
update_check.sh: extract launchpad project name from URL instead of guessing it.
add update_* to most packages starting with "c".
set update_* for my packages, and zlib
update_check.sh: regard dashes as dots for version comparison.
add update_* to most packages starting with "d".