QtQuickCompiler sources are not distributed, so for BYOS builds
we need to disable. For now, only print note that it's not supported.
Next step is to try to use the precompiled version from SDK.

Change-Id: I8185e66fd2bc6471218ee3ea8520fa40c2c08592
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@theqtcompany.com>