debian: liblightwood-dev does not need to depend on clutter-gst

This package does use clutter-gst during its build, but only for
sample code that is not part of the library.

Signed-off-by: Simon McVittie <smcv@collabora.com>
Reviewed-by: Justin Kim <justin.kim@collabora.com>
Differential Revision: https://phabricator.apertis.org/D6891

debian/control

@@ -56,7 +56,6 @@ Multi-arch: same
 Depends:
  gir1.2-liblightwood-1 (= ${binary:Version}),
  libchamplain-0.12-dev,
- libclutter-gst-3.0-dev,
  libglib2.0-dev,
  liblightwood-1-0 (= ${binary:Version}),
  libthornbury-dev (>=0.1703.0),