Add support for Graphviz. Patch contributed by Anton Korobeynikov.

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actually going on.

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Have configure find the "dotty" program and adjust configuration.

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If installed, ignore the prefix the tree is configured with: always use the
prefix that llvm-config is currently at, which may be different if the tree
was moved.

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when run out of a build directory.

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to link in the implementation.  Thanks to Anton Korobeynikov for figuring out
what was going on here.

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by our illustrious project leader.

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for the "build with one prefix and move the installed files to another dir"
problem.

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configuration settled down.

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