[compiler-rt][asan|win] Force tls_init test to use dynamic runtime

Summary:
There is no guarantee that the tls_init is executed on the static runtime
(/MT).

On windows 7, this unittest is failing.
On windows 10, I believe it's working because of the new CRT.

On ASAN side, it doesn't matter that the hook point is run or not.
It must be run only if there is other tls_initializer that are registered.

Reviewers: rnk, chrisha

Reviewed By: rnk

Subscribers: kubamracek, llvm-commits

Differential Revision: https://reviews.llvm.org/D29838

llvm-svn: 295057