Example Recipebrowser in WebEngine needs QuickControls2

Hi all,

I'm trying to compile Qt5.9.2 from source and it fails because of this commit.

I'm compiling Qt without quickcontrols2 and as far as I know the webengine itself isn't in need of that module, but the example recipebrowser is - so it fails to compile.

A much better solution here would be to wrap the example in the pro-file with the use of qtHaveModule like:

TEMPLATE=subdirs

SUBDIRS += \
    customdialogs \
    minimal \
    quicknanobrowser

qtHaveModule(quickcontrols2) {
    SUBDIRS += \
    recipebrowser
}

Then it wouldn't cause an error and crash the "entire" build.

Like always: Just ask if you need more details.

Thanks and kind regards,
Mike