NSD 4.6.1

This release has a couple of bug fixes. The alpn is set for dns over
tls connections. And the SVCB type supports the dohpath parameter.

4.6.1

FEATURES:

• Set ALPN "dot" token during connection establishment as per RFC9103
  section 7.1 (Thanks Cesar Kuroiwa).
• Add SVCB dohpath support

BUG FIXES:

• Fix static analyzer reports, fix wrong log print when skipping xfr,
  fix to print error on pipe read fail, and assert an xfr is in
  progress during packet checks.
• Use AC_PROG_CC_STDC with autoconf versions prior to 2.70.
• Add missing documentation for zone verification.
• Fix #212: Change commandline control actions to always log.
• Merge #231 from moritzbuhl: Fix checking if nonblocking sockets work
  on OpenBSD.
• Change zone parsing to accept non-trailing newline.