doxygen 1.7.2 no longer wants to create the output directory itself. Do so when necessary.
doxygen 1.7.2 no longer wants to create the output directory itself. Do so when necessary.

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@22850 0785d39b-7218-0410-832d-ea1e28bc413d

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