Enable QtQuickCompiler after fixes landed in QtDeclarative
and QtQuickCompiler

Change-Id: I339b72fe83316499bdccaf2ae484db63d87c6ed9
Reviewed-by: Teemu Holappa <teemu.holappa@qt.io>

Needs updates for meta-qt5 and meta-mingw

Temporarily disable QtQuickCompiler (QTRD-2219)

Change-Id: I089e4b4ce56030a37ee42324c13d43bade492bf3
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>

It's only included in internal builds, since the repository is not
public.

qdbd not started by default, ADB is still the default. It can be started
with `systemctl start qdbd`. It can be started in future boots with
`systemctl enable qdbd`.

Task-number: QTBUG-56069
Change-Id: I71340cdb31de823e1375986d34f2f07e7be5971b
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>

Make sure the we use QtQuickCompiler only when we either have access
to the sources (internal gerrit repo) or the prebuilt binaries are available.

The internal-build class checks if we are working within The Qt Company network,
so we will also have access to the sources. Setting ENABLE_QTQUICKCOMPILER env
to "1" in local.conf has the same effect. Otherwise check if the prebuilt
binaries are available as installed by the Qt Online SDK.

Change-Id: I63b09ebabc96bb14b119ea7472a3fa7b10e5c2a8
Task-number: QTBUG-53052
Task-number: QTBUG-53216
Reviewed-by: Teemu Holappa <teemu.holappa@theqtcompany.com>

License changed to GPLv3 + Commercial

Change-Id: I267c97216e717ed29071df064337e1bcf83de973
Reviewed-by: Kalle Viironen <kalle.viironen@theqtcompany.com>

Use bbclass to test if the internal sstate and download mirror
server is available before enabling them.

Change-Id: Ie927bdfca486232e3d3a55009139a9c27ff98aad
Reviewed-by: Teemu Holappa <teemu.holappa@theqtcompany.com>