Qt5: Remove useless qt.qtqa-tests.insignificant property

qt.qtqa-tests.enabled = 0 for these configurations, so there is no
point in marking them as insignificant.

Change-Id: I841f2e796c8b0c8709c8591f9f3319fc1684269f
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>
Qt5: Adjust configure options for Android

QtTranslations is building on Android, so there is no
need to skip it anymore.

Change-Id: Ie3114549272427358f741cc78c3e84fd7ed356e9
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>