Disable all dependency output options when using the Tooling library.
It isn't appropriate for a tool to be stomping over the dependency files,
especially if the actual build uses a compiler other than Clang or the tool
cannot find all the headers for some reason (which would cause the existing
dependency file to be deleted).
If a tool actually needs to care about dependency files we can think about
adding a mechanism for getting to this information.
Differential Revision: http://llvm-reviews.chandlerc.com/D2912
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202669
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