QmlDbgHelper: Fix compilation for Symbian target in SDK

The Symbian3Qt473 folder in the SDK contains a .qmake.cache
with invalid QMAKE_MOC path. Override this in the .pro file.
Also make sure that the .prl file is generated (create_prl was
set in the .qmake.cache)

Change-Id: Ibf905b4d9a8addf1b45a2ee40acdd0134da30e11
Reviewed-on: http://codereview.qt.nokia.com/1977


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>

share/qtcreator/qml/qmljsdebugger/qmljsdebugger.pro

@@ -2,7 +2,7 @@
 # It enables debugging of Qt Quick applications 
 
 TEMPLATE = lib
-CONFIG += staticlib
+CONFIG += staticlib create_prl
 QT += declarative script
 
 DEFINES += BUILD_QMLJSDEBUGGER_STATIC_LIB

src/plugins/qtsupport/debugginghelperbuildtask.cpp

@@ -165,6 +165,7 @@ bool DebuggingHelperBuildTask::buildDebuggingHelper(QFutureInterface<void> &futu
     Utils::BuildableHelperLibrary::BuildHelperArguments arguments;
     arguments.makeCommand = m_makeCommand;
     arguments.qmakeCommand = m_qmakeCommand;
+    arguments.qmakeArguments = QStringList() << QLatin1String("-nocache");
     arguments.targetMode = m_target;
     arguments.mkspec = m_mkspec;
     arguments.environment = m_environment;