Remove avahi tests in configure

[pierre-labastie]

If avahi is not installed, and --disable-avahi is not passed, configure errors out. But this shouldn't happen, since neither AVAHI_CFLAGS nor AVAHI_LIBS nor HAVE_AVAHI is used in the code...

Steps to reproduce the behavior:

1. Uninstall avahi-dev if it is installed
2. run configure without passing --disable-avahi
3. It stops with a message starting with: "configure: error: Package requirements (avahi-client) were not met ..."

Expected behavior Since avahi is nowhere used, it shouldn't be needed to have configure run to completion.

System Information:

• reproducible on both debian bookworm and linux from scratch. cups-filters version is 2.0.0

[pierre-labastie]

This should be fixed by #558

[eli-schwartz]

Indeed, not sure why I didn't notice this to cross-link it, fixed ^^