qtwayland: add dependency on libxcomposite
qtwayland: add dependency on libxcomposite

* fixes QA:
  qtwayland-5.6.99+5.7.0-beta+gitAUTOINC+d27075a3f9: qtwayland-plugins rdepends on libxcomposite, but it isn't a build dependency, missing libxcomposite in DEPENDS or PACKAGECONFIG? [build-deps]

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

kraj/meta-qt5,timopulkkinen/meta-qt5,sapiippo/meta-qt5,sapiippo/meta-qt5,opendreambox/meta-qt5,schnitzeltony/meta-qt5,kraj/meta-qt5,timopulkkinen/meta-qt5,timopulkkinen/meta-qt5,timopulkkinen/meta-qt5,meta-qt5/meta-qt5,opendreambox/meta-qt5,schnitzeltony/meta-qt5,opendreambox/meta-qt5,meta-qt5/meta-qt5