#483 libspectrum - requires ldconfig

[Benton Ferguson]

This may not be necessary on all distros, but I couldn't figure out why Fuse was not finding libspectrum libs when it was built successfully and in the right folder.
After some googling, I discovered sudo ldconfig will update recently installed libraries. Adding this to the end of the make install script will save this pain for future users.
Thanks, and keep up the awesome work!

[Arki55]

Can this be anyhow better specified on which OS and version this was ?

Need to use "sudo" is not mentioned in any README/INSTALL file of Libspectrum repo.
Except for GitHub workflow files (sudo make install).

Configure file contains it as part of "finish_cmds" in multiple places.
Also there is the following comment:

"Also, make sure you have run ldconfig if that is required on your system."
(regarding Audiofile library)

Maybe it would be enough to mention this line within README file ?