libxml: small tweaks.
libunistring: version bumped to 0.9.4.
ffmpeg: version bumped to 2.4.
chromium: Some adjustments here. Borrowed some hints and chromium-launcher.sh from

the good folks at gentoo (hats off). The changes are mostly to accomodate the possible
use of pepperflash, there should be no issues with flash-plugin-11.