[PULL] move sha1 from render/ to os/, add libgcrypt option

[Julien Cristau]

Hi Keith,

The following changes since commit 25344ba7f7845654364d62bf15322b3b79465bd9:
  Yaakov Selkowitz (1):
        dolt: add Cygwin to supported platforms

are available in the git repository at:

  git://people.freedesktop.org/~jcristau/xserver sha1

Julien Cristau (3):
      Move SHA1 computation from render/glyph.c to os/
      configure: add --with-sha1={libmd,libcrypto} option
      Add libgcrypt as an option for SHA1

I integrated suggestions from Daniel after the initial patch; this
iteration got reviewed by Rémi (thanks!).

 configure.ac            |   73 +++++++++++++++++++++---------
 include/Makefile.am     |    3 +-
 include/dix-config.h.in |    5 ++-
 include/xsha1.h         |   19 ++++++++
 os/Makefile.am          |    4 +-
 os/xsha1.c              |  113 +++++++++++++++++++++++++++++++++++++++++++++++
 render/glyph.c          |   36 ++++-----------
 7 files changed, 202 insertions(+), 51 deletions(-)
 create mode 100644 include/xsha1.h
 create mode 100644 os/xsha1.c