[clang-tidy] Remove extra config.h includes

It's included in a new header ClangTidyForceLinker.h and should not
be included the second time.

Follow up for the https://reviews.llvm.org/D55595

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@349132 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed