Make DEAL_II_USE_MT a true variable with a value, not only something that can be tested for existence with the preprocessor.
Make DEAL_II_USE_MT a true variable with a value, not only something that can be tested for existence with the preprocessor.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@6765 0785d39b-7218-0410-832d-ea1e28bc413d

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