The create-dmg script changed repo name - let's support either version.
On newer Macs the SDKs are elsewhere - let's look there, too.
Let's be far more flexible when finding SDK versions.
Let's not assume that we are linking against QtWebKit (we're not with Qt6).
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
ebb7d97474