Error running ice-server on build of Ubuntu 21.04

[Misterblue]

When building vircadia/master on Ubuntu 21.04, it uses the binary Qt so it doesn't create the directory /opt/vircadia/qt5-install/lib and the scripts in /opt/vircadia/install_master/ice-server/ice-server (for instance) still references that library.

Ubuntu 21.04 builds but, when I run the ice-server script, I get the error:

/opt/vircadia/install_master/ice-server/ice-server: error while loading shared libraries: libQt5Network.so.5: cannot open shared object file: No such file or directory.

I think the problem with Ubuntu releases that have a binary Qt not having a /opt/vircadia/qt5-install/lib directory is a general problem.