Also ClangTidyTests requires clangLex.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@244599 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/clang-tidy/CMakeLists.txt

@@ -20,6 +20,7 @@ target_link_libraries(ClangTidyTests
   clangASTMatchers
   clangBasic
   clangFrontend
+  clangLex
   clangTidy
   clangTidyGoogleModule
   clangTidyLLVMModule