xorg-server: Changes to 'ubuntu-xenial-lts'

[Timo Aaltonen <tjaalton@moszumanska.debian.org>]

New branch 'ubuntu-xenial-lts' available with the following commits:
commit e5b74d97ce99ed9b5df61273a19e1c1284ad72ce
Author: Timo Aaltonen <tjaalton@debian.org>
Date:   Mon Jul 4 23:23:50 2016 +0300

    relax dev package dep on coreproto

commit b381655e209efad59b1e19f7157231283552c0cd
Author: Timo Aaltonen <tjaalton@debian.org>
Date:   Wed Jun 29 00:02:31 2016 +0300

    first upload to trusty

commit 86350c308b6290fce0fcda8a6e1ce5b9e07ade75
Author: Timo Aaltonen <tjaalton@debian.org>
Date:   Wed Jun 29 00:02:10 2016 +0300

    rules: work around ftbfs on ppc64el

commit 61f766bc640d6b6b787fe4b3e4248a0333d090e8
Author: Timo Aaltonen <tjaalton@debian.org>
Date:   Tue Jun 28 17:16:23 2016 +0300

    don't depend on newer coreproto

commit 8eef939979fc0d9fee163eb8b8ef075ebbb1c713
Author: Timo Aaltonen <tjaalton@debian.org>
Date:   Tue Jun 28 13:24:36 2016 +0300

    don't depend on libsystemd-dev

commit 4e7f0c1196439d4132d368fb2b773c9827c5ccf3
Author: Timo Aaltonen <tjaalton@debian.org>
Date:   Tue Jun 28 13:20:10 2016 +0300

    lts-xenial packaging