fix crash when removing artifact

When removing an artifact we also must remove it from the outputs of the
transformer that produced it. The situation where such an artifact is
later reused only occurs in dynamic multiplex rules, which is why we
never caught this.

Task-number: QBS-640
Change-Id: I675edc1e84e04886e09a959b548c0425ed932745
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
libqtprofilesetup: Take prl files into account.

That is, extract libraries, frameworks and other linker flags
from QMAKE_PRL_LIBS and add set the respective properties
in qbs' Qt module files accordingly.

Task-number: QBS-618
Change-Id: I404a3c07af6fdebb8e2862fefd5696aada7a58e7
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>