alsa.m4: another fix to not link all binaries with -latopology
alsa.m4: another fix to not link all binaries with -latopology

Preserve LIBS when the -latopology is tested. It's added later.

Signed-off-by: Jaroslav Kysela <72edd5e1a572f82f059ccbb83c92b74d6cb051ff@perex.cz>

alsa-project/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib,tiwai/alsa-lib,tiwai/alsa-lib,tiwai/alsa-lib,takaswie/alsa-lib