package/qextserialport: convert to qmake infra

This commit converts the qextserialport to the qmake infra, which is a
straightforward conversion as it doesn't require any custom
environment option or additional hook.

Signed-off-by: Andreas Naumann <anaumann@ultratronik.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
1 file changed