Merge remote-tracking branch 'origin/master' into stdenv-updates.
Revert "Merge pull request #567 from MarcWeber/submit/cmake-improvement"

This reverts commit abc7591aaf3912d819401241d7d2339fb96441f3, reversing changes
made to 6b1ebeccf2c9d9e8f68d7e21a1e55b5d91577683, because they broke half the
packages in stdenv-updates: http://hydra.nixos.org/eval/927013 has further
details.
add "quilt" (patch manager)
kernel/generic: pass through prePatch as well
new package: "linux-lts-3.0"

Long term support kernels:
http://ltsi.linuxfoundation.org/what-is-ltsi
new package: "linux-lts-3.4"

Long term support kernels:
http://ltsi.linuxfoundation.org/blog/2013-01-22/ltsi-v3.4-released
default kernel: upgrade to 3.4 lts
linux headers 3.4 lts - needs refactoring
switch to 3.4lts headers
glibc: make minimum supported kernel version configurable

The minimum we support is 3.2.43 which is nixos' default kernel in
master. On every stdenv-updates merge, we will move this number up to
the previous latest default kernel.

for people who want older kernels, a "compat" setting (headers +
glibc) will soon appear