fixup! am: Use cat instead of echo to avoid DOS line-endings (fixes t4150)

This is no longer necessary since 'am' is a builtin.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

contrib/examples/git-am.sh

@@ -188,9 +188,7 @@ It does not apply to blobs recorded in its index.")"
 }
 
 clean_abort () {
-	test $# = 0 || cat >&2 <<EOF
-$@
-EOF
+	test $# = 0 || echo >&2 "$@"
 	rm -fr "$dotest"
 	exit 1
 }