Pull request: all: imp scripts

Merge in DNS/adguard-home from imp-sh to master

Squashed commit of the following:

commit 477832e11eca2ef7ac0071b5da938dacb2ed617d
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed May 19 20:24:34 2021 +0300

    scripts: rm dbg

commit dbb4b8c783f607781b980dcd57d78085c9022e72
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed May 19 20:21:20 2021 +0300

    all: imp code, compat, docs

commit e6e4375d67ad1c213efb04411e3ba0bc6293f936
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed May 19 19:33:48 2021 +0300

    all: imp scripts

scripts/make/go-deps.sh

@@ -1,36 +1,37 @@
 #!/bin/sh
 
 verbose="${VERBOSE:-0}"
+readonly verbose
 
 if [ "$verbose" -gt '1' ]
 then
 	env
 	set -x
-	readonly v_flags='-v'
-	readonly x_flags='-x'
+	v_flags='-v'
+	x_flags='-x'
 elif [ "$verbose" -gt '0' ]
 then
 	set -x
-	readonly v_flags='-v'
-	readonly x_flags=''
+	v_flags='-v'
+	x_flags=''
 else
 	set +x
-	readonly v_flags=''
-	readonly x_flags=''
+	v_flags=''
+	x_flags=''
 fi
+readonly v_flags x_flags
 
 set -e -f -u
 
 go="${GO:-go}"
 
-# Don't use quotes with flag variables because we want an empty space if
-# those aren't set.
+# Don't use quotes with flag variables because we want an empty space if those
+# aren't set.
 "$go" mod download $x_flags
 
 # Reset GOARCH and GOOS to make sure we install the tools for the native
-# architecture even when we're cross-compiling the main binary, and also
-# to prevent the "cannot install cross-compiled binaries when GOBIN is
-# set" error.
+# architecture even when we're cross-compiling the main binary, and also to
+# prevent the "cannot install cross-compiled binaries when GOBIN is set" error.
 env\
 	GOARCH=""\
 	GOOS=""\