move have_patool and 7z detection to erc-sh-archive

bin/erc-sh-archive

 #!/bin/bash
 #
-# Copyright (C) 2013  Etersoft
-# Copyright (C) 2013  Vitaly Lipatov <lav@etersoft.ru>
+# Copyright (C) 2013, 2023  Etersoft
+# Copyright (C) 2013, 2023  Vitaly Lipatov <lav@etersoft.ru>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -17,6 +17,20 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 
+have_patool()
+{
+	# TODO: optimize?
+	is_command patool
+}
+
+HAVE_7Z=''
+if ! have_patool ; then
+	# TODO: try install patool and p7zip
+	is_command 7za && HAVE_7Z="7za"
+	is_command 7z && HAVE_7Z="7z"
+fi
+
+
 list_subformats()
 {
 	local i

bin/tools_erc

@@ -43,18 +43,6 @@ build_target_name()
         return 1
 }
 
-have_patool()
-{
-	# TODO: optimize?
-	is_command patool
-}
-
-HAVE_7Z=''
-if ! have_patool ; then
-	# TODO: try install patool and p7zip
-	is_command 7za && HAVE_7Z="7za"
-	is_command 7z && HAVE_7Z="7z"
-fi
 
 # TODO: list of $HAVE_7Z supported (see list_formats)