unify err functions across scripts

include/err.sh

this new handling also does mundane things,
such as tell you what script b0rked

Signed-off-by: Leah Rowe <leah@libreboot.org>

fetch_trees

@@ -24,6 +24,8 @@
 [ "x${DEBUG+set}" = 'xset' ] && set -v
 set -u -e
 
+. "include/err.sh"
+
 _target=""
 tree=""
 rev=""
@@ -175,10 +177,4 @@ prepare_new_tree()
 	)
 }
 
-err()
-{
-	printf "ERROR, %s, %s\n" $0 $1 1>&2
-	exit 1
-}
-
 main $@