Update release date

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
build: do not error out when g++ is absent on non-BEOS

Only BEOS/Haiku require g++ (due to sound_beos.cpp); on all other
platforms, make sure we do not error out during linking when g++ is
absent.

Signed-off-by: Jan Engelhardt <jengelh@inai.de>