qtbase.inc: add -no-xkbcommon

If one builds with xkb, both -no-xkb and
-no-xkbcommon should be set.
Without -no-xkbcommon you'll get link-errors
for libcomposeplatforminputcontextplugin.so

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
qtwebkit: add packageconfig for qtmultimedia

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>