Fix for Whitespace in paths

[scott constable via llvm-commits]

Dear Reviewer,

The current doxygen.cfg.in will produce paths that cannot be understood by
Doxygen/Graphviz, when any generated paths contain white space. This patch
simply adds quotations to all generated paths so that white space cannot be
misinterpreted by Doxygen/Graphviz.

~Scott Constable
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