qwt: needs qt5 widgets/printsupport

Fixes [1]:

  Project ERROR: Unknown module(s) in QT: printsupport

[1] http://autobuild.buildroot.net/results/b9a/b9adbc61922c89ad7a0e5dd13cd2ce3bde864ede

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qwt/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_QWT
 	depends on BR2_PACKAGE_QT || BR2_PACKAGE_QT5
 	select BR2_PACKAGE_QT_GUI_MODULE if BR2_PACKAGE_QT
 	select BR2_PACKAGE_QT5BASE_GUI if BR2_PACKAGE_QT5
+	select BR2_PACKAGE_QT5BASE_WIDGETS if BR2_PACKAGE_QT5 # printsupport
 	select BR2_PACKAGE_QT5BASE_CONCURRENT if BR2_PACKAGE_QT5
 	help
 	  Qwt is a graphics extension to the Qt GUI application