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If people want to change WINVER, they likely want to change NTDDI_VERSION as
well, so it make sense to have both in the same config.

The one other use of :winver, usrsctp, didn't change NTDDI_VERSION, but
it looks like it doesn't need to change WINVER anymore anyhow (it did that for
XP support), so drop it there.

No intended behavior change.

BUG=639853

Review-Url: https://codereview.chromium.org/2265013003
Cr-Commit-Position: refs/heads/master@{#413480}