Link lldb-mi only to the llvm components it uses

Summary:
liblldb does not re-export the llvm library contained within, so lldb-mi needs to
manage its own dependencies. Right now it only uses the llvm support library.

Reviewers: beanz, zturner, tfiala, clayborg, abidh

Subscribers: ki.stfu, mgorny, lldb-commits

Differential Revision: https://reviews.llvm.org/D26190

llvm-svn: 285894