fix travis failure for ccache command not found
Summary: Travis don't have ccache installed on Mac. Only run the ccache command when it exists. https://docs.travis-ci.com/user/caching/#ccache-cache Closes https://github.com/facebook/rocksdb/pull/2990 Differential Revision: D6028837 Pulled By: yiwu-arbug fbshipit-source-id: 1e2d1c7f37be2c73773258c1fd5f24eebe7a06c6
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