[PATCH] cmake: Find xdot or xdot.py

[Matt Arsenault]

  Update autotools build to match

Hi chandlerc,

http://llvm-reviews.chandlerc.com/D715

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D715?vs=1746&id=2605#toc

Files:
  autoconf/configure.ac
  cmake/config-ix.cmake
  configure
  include/llvm/Config/config.h.cmake
  include/llvm/Config/config.h.in
  lib/Support/GraphWriter.cpp
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