build: Share the all-local rule for linking libraries into the build dir

build: Share the all-local rule for linking libraries into the build dir

This consolidates how we link the libraries into the build directory.
It works for lib_LTLIBRARIES but not custom shared libraries like DRI
drivers or gallium state trackers which needs special casing (cf dri
mega drivers, for example)

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>