Pull request 1856: fix-dhcpd-tags

Merge in DNS/adguard-home from fix-dhcpd-tags to master

Updates #5615.

Squashed commit of the following:

commit 386b5a67b07cf8b06f4e4003870fbf3db5dfc94d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri May 26 12:23:41 2023 +0300

    dhcpd: fix bsd tags

internal/dhcpd/conn_bsd.go

@@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin || freebsd || openbsd
 
 package dhcpd
 

internal/dhcpd/conn_bsd_internal_test.go

@@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin || freebsd || openbsd
 
 package dhcpd
 

internal/dhcpd/conn_linux.go

@@ -1,4 +1,4 @@
-//go:build freebsd || linux || openbsd
+//go:build linux
 
 package dhcpd
 

internal/dhcpd/conn_linux_internal_test.go

@@ -1,4 +1,4 @@
-//go:build freebsd || linux || openbsd
+//go:build linux
 
 package dhcpd