qrc: add support for "large resources" on iOS

~/code/projects/test_rcc$ cat main.cpp 
#include <QtGui>

int main(int argc, char **argv){
     QGuiApplication app(argc, argv);
     qDebug() << QFile(":/main.qml").exists();
     return app.exec();
}

~/code/projects/test_rcc$ cat main.qrc
<RCC>
    <qresource prefix="/">
        <file>main.qml</file>
    </qresource>
</RCC>

~/code/projects/test_rcc$ cat test_rcc.pro 
######################################################################
# Automatically generated by qmake (3.0) Mon Mar 31 14:33:40 2014
######################################################################

TEMPLATE = app
TARGET = test_rcc
INCLUDEPATH += .

RESOURCES += main.qrc

# Input
SOURCES += main.cpp

~/code/projects/test_rcc$ cat main.qml 
This is just s dummy text file