qextserialport: define QEXTSERIALPORT_CONFIGURE_CMDS only once

Distinguish qt/qt5 by defining QEXTSERIALPORT_QMAKE, like is done e.g.
for quazip.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
1 file changed