Comment 0 for bug 1400626

In order to upload the new xorg-server we need to backport the following packages from utopic:
libdrm
x11proto-core
x11proto-fonts
xtrans

libdrm 2.4.52-1->2.4.56-1 seems to have the following changes:
- Hides private symbols from all libdrm libraries
- fixes MSAA on Hawaii (radeon).
- Adds cherryview pci-ids (intel).
- Makes libdrm-nouveau threadsafe with concurrent access to the drm fd.
- Fixes to exynos and freedreno.
- Enables building libdrm-freedreno1 and libdrm-exynos1

x11proto-core's main change appears to be changing from the 'pointer' type to 'void *':
https://launchpadlibrarian.net/173873109/x11proto-core_7.0.24-1_7.0.26-1.diff.gz

x11proto-fonts' main change is the same as x11proto-core, but the documentation is reformatted too:
https://launchpadlibrarian.net/173873038/x11proto-fonts_2.1.2-1_2.1.3-1.diff.gz

xtrans seems to have 2 minor changes, increase default unix pipe size and add support for systemd socket activation:
https://launchpadlibrarian.net/173873112/xtrans_1.3.2-1_1.3.4-1.diff.gz