Bump LXC to 1.0.0.beta1

Tested locally. Builds and works for me.
apache-httpd-2.4: revert "enable building the 'event'-based mpm worker"

Commit 0c3d910cd027a926ffc8538ea60cf2da099d7808 didn't have any effect.
The 'event' MPM module isn't built because our version of APR is too old.
tailor: Add extra source URL
mc: update from 4.8.0 to 4.8.11
xlibs.xf86videointel: update from 2.21.9 to 2.21.15
Add meta.branch to some packages
Merge pull request #1465 from msackman/master

Bump LXC to 1.0.0.beta1
Pass correct Qt version to octaveFull for GUI
haskell-poppler package is added.
haskell-poppler: re-generate expression with cabal2nix
haskell-pretty-show: update to version 1.6.5
haskell-git-annex: update to version 5.20140107
haskell-SHA: update to version 1.6.3
haskell-cipher-aes128: update to version 0.6.1
haskell-fast-logger: update to version 2.1.1
haskell-highlighting-kate: update to version 0.5.6
haskell-hxt: update to version 9.3.1.3
haskell-idna: update to version 0.3.0
haskell-stringprep: update to version 1.0.0
haskell-system-fileio: update to version 0.3.12