suppress qml import scan for the tools which don't need it

Change-Id: Iefdaf60edbe47d2941a0696d96e7b79a67b46d8d
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

tools/qmlbundle/qmlbundle.pro

 QT       = core qml-private  core-private
+CONFIG  += no_import_scan
 
 SOURCES += main.cpp
 

tools/qmlplugindump/qmlplugindump.pro

 QT += qml qml-private quick-private core-private
 
-CONFIG += qpa_minimal_plugin
+CONFIG += no_import_scan qpa_minimal_plugin
 
 SOURCES += \
     main.cpp \

tools/qmlprofiler/qmlprofiler.pro

 QT = qml qml-private network core-private
+CONFIG += no_import_scan
 
 SOURCES += main.cpp \
     qmlprofilerapplication.cpp \

tools/qmlscene/qmlscene.pro

 QT += qml quick core-private
 qtHaveModule(widgets): QT += widgets
+CONFIG += no_import_scan
 
 SOURCES += main.cpp
 

tools/qmltestrunner/qmltestrunner.pro

 SOURCES += main.cpp
 
 QT += qml qmltest
+CONFIG += no_import_scan
 
 load(qt_tool)