make use of qtHaveModule()

Change-Id: I14da5455b7dd4681254e1652395df5f5c65746bd
Reviewed-by: Tasuku Suzuki <stasuku@gmail.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@gmail.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/plugins/directshow/camera/camera.pri

@@ -23,7 +23,7 @@ SOURCES += \
     $$PWD/dsimagecapturecontrol.cpp \
     $$PWD/dscamerasession.cpp
 
-!isEmpty(QT.widgets.name) {
+qtHaveModule(widgets) {
     HEADERS += $$PWD/dsvideowidgetcontrol.h
     SOURCES += $$PWD/dsvideowidgetcontrol.cpp
 }

src/plugins/directshow/directshow.pro

@@ -11,7 +11,7 @@ SOURCES += dsserviceplugin.cpp
 
 !config_wmsdk: DEFINES += QT_NO_WMSDK
 
-!isEmpty(QT.widgets.name) {
+qtHaveModule(widgets) {
     QT += multimediawidgets
     DEFINES += HAVE_WIDGETS
 }

src/plugins/directshow/player/player.pri

@@ -35,7 +35,7 @@ SOURCES += \
         $$PWD/mediasamplevideobuffer.cpp \
         $$PWD/videosurfacefilter.cpp
 
-!isEmpty(QT.widgets.name):!simulator {
+qtHaveModule(widgets):!simulator {
     HEADERS += \
         $$PWD/vmr9videowindowcontrol.h