Fix run-depends check for py-llfuse after shared libs naming change

Newer python versions (after 3.8.7) have changed the names of extension
shared libraries from ".so" to e.g. ".cpython-38.so". So for the FUSE
option, now check for the py-llfuse package instead of the dynamic
library llfuse.so.

Approved by: jjuanino@gmail.com (maintainer)
PR: 253907
MFH: 2021Q