Suppress clang/test/Sema/struct-packed-align.c also on msvc for investigating.

FIXME: This test is incompatible to MS compat mode.
FIXME: Don't suppress this also on mingw. :-p

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@214301 91177308-0d34-0410-b5e6-96231b3b80d8