Unfortunately subpackages do not support debscripts currently, so nc & netcat
symlinks can't be managed through update-alternatives. As there no other way
to have these symlinks in multiple packages without conflict, nmap package
receives the following changes:
* Rename netcat subpackage to nmap-ncat.
* Remove symlinks nc and netcat pointing to ncat.
***
Requested in https://github.com/termux/termux-packages/issues/6921.
