route.c: change the signature of get_default_gateway()

route.c: change the signature of get_default_gateway()

As a preparation of an upcoming refactoring of
get_default_gateway(), add `dest` parameter to
specify destination address to which we are looking
the best route.

Change-Id: I58735fb24bc4a94c803b7dfcd6de87af0f75522a
Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20250129095038.19056-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg30685.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>