Subject: bug#30199: clean version script

From: Alexei Podtelezhnikov <[email-masked]>
Date: Sun, 21 Jan 2018 13:44:23 -0500

When I use link mode with -export-symbols, libtool wraps them into a
version script and puts a new file into .libs. Then it forgets to
clean the created script in clean mode.

It should be able to clean after itself and remove the version script.