Log Message:
Update to 1.2.3:

Alan Coopersmith (4):
      18748: xtrans.m4 causes configure --help to list --enable-ipv6
      in wrong case.
      Switch ChangeLog generation to use XORG_CHANGELOG from xorg-macros 1.2
      Add bugzilla, mailing list & git repo pointers to README
      Version 1.2.3

Alan Hourihane (1):
      add winsock check for windows builds