Merge pull request #365 from euanh/build-improvements

linux-guest-loader: Must provide obsoleted package, with versions
Merge pull request #366 from euanh/build-improvements

makedeb: Need mapping for 'eliloader' because 'linux-guest-loader' still...
specdep: Use the chroot's %dist when building SRPMs

Signed-off-by: Euan Harris <euan.harris@citrix.com>