Bug 1244142 - Vagrant: Remove unnecessary package install/updates
Bug 1244142 - Vagrant: Remove unnecessary package install/updates

Removes the gcc and libxml2-dev entries.

The gcc entry is a no-op, since no newer version is available for Ubuntu
14.04. It's not clear what previously required libxml2-dev, however it
was introduced in a commit that added AWS support for the now
decommissioned AWS dev environment. Either way the provision succeeds
without it now.

akhileshpillai/treeherder,tojonmz/treeherder,tojon/treeherder,kapy2010/treeherder,wlach/treeherder,tojon/treeherder,kapy2010/treeherder,KWierso/treeherder,akhileshpillai/treeherder,akhileshpillai/treeherder,KWierso/treeherder,edmorley/treeherder,wlach/treeherder,tojon/treeherder,KWierso/treeherder,glenn124f/treeherder,kapy2010/treeherder,tojonmz/treeherder,edmorley/treeherder,glenn124f/treeherder,wlach/treeherder,wlach/treeherder,KWierso/treeherder,edmorley/treeherder,kapy2010/treeherder,glenn124f/treeherder,kapy2010/treeherder,glenn124f/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,edmorley/treeherder,wlach/treeherder,glenn124f/treeherder,wlach/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,tojonmz/treeherder,tojon/treeherder,tojonmz/treeherder