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Add SOURCE_SUBDIR option to ExternalProject

Matthew Woehlke requested to merge matthew-woehlke/cmake:externalproject-source-subdir into master

Add a new SOURCE_SUBDIR option to ExternalProject_Add that allows specifying the location of the CMakeLists.txt to use as the project root relative to the SOURCE_DIR.

This is helpful for projects that have odd layouts, or projects that provide both a superbuild and project-only build depending on which CMakeLists.txt is used.

See also http://stackoverflow.com/questions/30028117.

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