More windows build fix attempts.

The windows ninja build is now green, but msvs is still unhappy. Maybe that's
because the .def file was passed when building LTO_static, so only pass
symbol lists for shared libraries.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198151 91177308-0d34-0410-b5e6-96231b3b80d8