Log Message:
Update 2.6, requested by ftigeot.

2.6:

Chad Versace (1):
      Add attachment token DRI2BufferHiz

Jesse Barnes (2):
      Revert "dri2proto: make DRI2 swap event match GLX spec"
      dri2proto: add a new DRI2BufferSwapComplete struct that matches the spec

2.4:

Gaetan Nadon (3):
      config: install and distribute dri2proto.txt
      config: remove the pkgconfig pc.in file from EXTRA_DIST
      config: update AC_PREREQ statement to 2.60

Jesse Barnes (1):
      dri2proto: make DRI2 swap event match GLX spec

Marcin Kościelnicki (1):
      Fix DRI2Connect line encoding to match existing code

Mike Stroyan (2):
      Add more info about dri2proto events
      Fix typo and obsolete reference in dri2proto.txt