Install the Heimdal version of compile_et (and asn1_compile for completeness)
using a heimdal_ prefix to avoid a name clash with e2fsprogs which installs a
similar but different (and older) compile_et shell script.
Then, tell Samba where to find the new Heimdal binaries.
Ref: https://bugzilla.samba.org/show_bug.cgi?id=13856
This was originally added because SO_REUSEPORT was not available on older kernels
With this setting, avahi-daemon does not use either SO_REUSEADDR or SO_REUSEPORT, which means that other mDNS applications cannot access the multicast udp port 5353 at the same time. This includes mDNS clients which are simply trying to discover other services on the network. One such client exists in a PVR add-on I am writing for Kodi which currently fails in network discovery when run on LibreELEC.
See also https://github.com/grandcat/zeroconf/issues/63
