s-nail: update to 14.7.1
st-git: update to 20140626
s-nail: update checksum too
which: use a working mirror.
systemd: update to v208-stable 722b700.
hooks: enable script-wrapper also in pre-install, some pkgs might need this.
xorg-server: update to 1.15.2.
linux3.15: update to 3.15.2.
linux3.14: update to 3.14.9.
git: update to 2.0.1.
rpi-kernel: update to upstream git commit 25673c31a1c (3.12.23).
rpi-firmware: update to upstream git commit affe5cd9d3e.
cairo-dock-plugins: fix -python{2,3.4} subpkg rdeps.
python-curl: rewrite to fix cross build
python-curl: remove unnecessary rdeps; no need to append CFLAGS; host libcurl-devel not necessary.
python3: removed; superseded by python3.4.
New package: python-notify-0.1.1 (python2-only), replaces notify-python

Fix cross build.
Revbump affected pkgs.
srcpkgs: remove dangling symlinks.
ntp: update to 4.2.7p445.
hooks/generate-gitrevs: simplify and just use "sourcepkg:gitshortrev".

Previous way was way too slow and somewhat redundant. Just with the
latest git short rev is enough to know at what point a pkg was built.