Override --entry in winegcc only when it applies to any compiler
(e.g. kernel drivers or msvcrt) but leave spec details to winebuild.

Forward -municode so winebuild will know which to use.
Signed-off-by: Kevin Puetz <PuetzKevinA@JohnDeere.com>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>