gen.sh: Don't generate bic data for internal modules

QtDesignerComponents, QtLucene and QtMultimediaQuick_p are
internal modules, so there is no need to generate bic data.

Change-Id: Id3663d4567c8cfae6a6d310ca377578e9f2923d2
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>