[examples] Add tablegen'd ClangCommentCommandList as a dependency for plugins.

Also, remove library dependencies for the sample analyzer-plugin. The only
library changes that would require a rebuild should be in headers, which
should already implicitly be marked as dependencies.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@201350 91177308-0d34-0410-b5e6-96231b3b80d8