Remove references to unused private headers variable in .pro files

Change-Id: Ia0e38843b4dc720e55d6e65d9bd97c27eeb7e9f7
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
Don't force a dynamic build when not configured for gcov

This is needed to allow Qt3D to build when Qt is configured for a
static build.

Change-Id: Ib3d5bbe3df57ef13d94788dcbadedef983b028a6
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
Stop qmake thinking a plugin is a module too

Change-Id: I7cf85692cf86bc0c5a4aceaa3af01f9e0ef3f5ce
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
Ensure the renderer's resources get linked when building statically

With this change the Qt3D examples are now able to run from a statically
built Qt.

Change-Id: Ib7fddeca35d29e9772ac13caf848844f376dbe88
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>