[CMake] Prune stray entries in add_dependencies(). target_link_libraries() implies it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@200531 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Suppress SampleAnalyzerPlugin w/o ENABLE_STATIC_ANALYZER.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@200532 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] clang doesn't care whether CLANG_ENABLE_*(s) were set or not.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@200533 91177308-0d34-0410-b5e6-96231b3b80d8