automake: introduce install-gallium-links.mk

This helper script will be used to minimise the duplication
during link generation across all gallium targets.

v2:
 - Handle vdpau_LTLIBRARIES. Requested by Christian König.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Jon TURNEY <jon.turney@dronecode.org.uk>
1 file changed