Comment # 3 on bug 1158728 from Robert Simai

I installed ardour5 from multimedia:apps, in addition I have multimedia:libs
which is where liblilv-0-0 comes from.

Interesting you say there was no code change, nonetheless the package was
rebuilt and zypper was happy to recommend it for an update on Sunday, likely
because of changes in the related package lv2. I digged a bit deeper:

nm -D /usr/lib64/liblilv-0.so.0 | grep serd_free
  U serd_free

and it turns out this symbol has to come from libserd-0.so from the libserd-0-0
package instead. But the version from the regular openSUSE repo is too old and
doesn't contain it so I changed to the version that comes from multimedia:libs 

Name        : lv2
Version     : 1.16.0
Release     : lp151.34.1
Vendor      : obs://build.opensuse.org/multimedia

and all is good now, the symbol is back. I guess you'll need to either update
this lv2 package in the main repo or add a dependency to make sure it comes
from multimedia:libs.