Log Message:
Update to modular-xorg-server-1.17.1.

Please note that the previous version is still available in
x11/modular-xorg-server112 in case this version does not work for you.
This is relevant for users who need DRI1 and/or XAA as those features have
been deprecated and removed by upstream since xorg-server-1.13.

Note also that this update breaks the driver ABI and that drivers will be need
to be rebuilt.

Summary of the important changes since 1.12:

xorg-server-1.17 (4 February 2015)
- Generic DRM/KMS driver xf86-video-modesetting

xorg-server-1.16 (17 July 2014)
- XWayland DDX
- GLAMOR acceleration
- non-PCI devices support
- systemd-logind support (rootless X)

xorg-server1.15 (27 December 2013)
- DRI3
- "present" extension

xorg-server-1.14 (5 March 2013)
- XInput 2.3

xorg-server1.13 (5 September 2012)
- New DDX driver API
- DRI2
- RandR 1.4
- OpenGL 3.x+ contexts
- XAA support removed