qextserialport: remove useless () around configure command

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

package/qextserialport/qextserialport.mk

@@ -19,7 +19,7 @@ QEXTSERIALPORT_QMAKE = $(QT5_QMAKE)
 endif
 
 define QEXTSERIALPORT_CONFIGURE_CMDS
-	(cd $(@D); $(TARGET_MAKE_ENV) $(QEXTSERIALPORT_QMAKE))
+	cd $(@D); $(TARGET_MAKE_ENV) $(QEXTSERIALPORT_QMAKE)
 endef
 
 define QEXTSERIALPORT_BUILD_CMDS