packagegroup-qt5-toolchain-target: always include qttools packages

The qttools packages were included only if the ruby layer was enabled
as it required qtwebkit. However, qttools now has a PACKAGECONFIG
option for qtwebkit and does not enable it by default so we can include
the qttools packages even if the ruby layer is not enabled.

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
nativesdk-qtbase: make it possible to keep additional libraries

In some usecases for the nativesdk, you might need some build tools that are built upon Qt5. This means
that we're having a need to keep more of the libraries build by nativsdk-qtbase. This patch adds the
infrastructure to support that

Signed-off-by: Anders Darander <anders@chargestorm.se>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>