tools/Makefile: Replace automake specific name of listings in Makfile.sources

Replace the automake specific names of listings in Makefile.sources with
something not automake specific.

Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
3 files changed