Fix the build with recent qtbase

Since 3cd70c11bc7bbe3c5e9e4972d2273cf51bbdc30e in
qtbase Qt modules require cmake tests to be present
which makes QtWebEngine fail with "Missing CMake tests."
We do not support building with cmake at this point,
so disable these tests by setting CMAKE_MODULE_TESTS
to '-' for module pro files.

Cherry-picked from: 1.0/bef6cc644f176a69a85c68126bd0d7e50ab5757e
Change-Id: I41d5006c48ea51cbaad919072dced414a923c97f
Reviewed-by: Andras Becsi <andras.becsi@digia.com>