Revert "Exclude wasm target from Windows packaging due to PR39448"

Summary:
This reverts r346122 now that the failing tests have been
disabled. Depends on D54353.

Reviewers: aheejin, dschuff

Subscribers: fedor.sergeev, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D54354

llvm-svn: 346559