[PULL server-1.8-branch] Cygwin configure fixes

[Yaakov (Cygwin/X)]

Peter,

These Cygwin-specific build patches were pulled into master just after 
1.8.0.

The following changes since commit b12f6142f356a72af64665e753c5a4e61b2a6ec1:
   Peter Hutterer (1):
         xfree86: remove dead input drivers from xorg.conf man page.

are available in the git repository at:

   git://anongit.freedesktop.org/~yselkowitz/xserver.git server-1.8-branch

Jon TURNEY (1):
       Don't enable ROOTLESS_WORKAROUND, it breaks composite

Yaakov Selkowitz (3):
       Disable setuid configure test on Cygwin
       Cygwin/X: Disable unsupported extensions in configure
       Cygwin/X: Add configure option for WindowsWM

  configure.ac |   37 +++++++++++++++++++++++--------------
  1 files changed, 23 insertions(+), 14 deletions(-)