The last use of qWinMain was removed in commit
390598cb43, "Winmain: Remove Windows CE."
It used to be used on non-WinCE, but that was dropped in commit
9b121e5579.
Change-Id: Idc347fbb462f4122b044fffd1490a210358a61b1
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>