[CMake] Patch needed to FindDoxygen.cmake for latest Graphviz distributions on Windows

[Steve Streeting]

I've modified my local FindDoxygen.cmake to be compatible with the 
latest versions of Graphviz, which were not be picked up by the module 
in CMake 2.8.0 on Windows, as follows:

--- FindDoxygen.cmake.old       2010-02-17 11:59:27.718750000 +0000
+++ FindDoxygen.cmake   2010-02-17 11:47:01.781250000 +0000
@@ -91,6 +91,7 @@
        "C:/Program Files/Graphviz 2.21/bin"
        "$ENV{ProgramFiles}/ATT/Graphviz/bin"
        "C:/Program Files/ATT/Graphviz/bin"
+      [HKEY_LOCAL_MACHINE\\SOFTWARE\\AT&T\ Research\ 
Labs\\Graphviz;InstallPath]/bin
        [HKEY_LOCAL_MACHINE\\SOFTWARE\\ATT\\Graphviz;InstallPath]/bin
        /Applications/Graphviz.app/Contents/MacOS
        /Applications/Doxygen.app/Contents/Resources

As you can see, the latest Graphviz packages don't use 'ATT' as the 
company registry key any more, they use 'AT&T Research Labs' instead.

Best regards
Steve

-- 
Steve Streeting
OGRE Project Lead
http://www.ogre3d.org
Email: sinbad at ogre3d.org