submodule: Use cat instead of echo to avoid DOS line-endings, was: Re: 4msysgit & tags

In msysGit, echo used in scripts outputs DOS line-endings while built-ins
use Unix line-endings in their output. This causes t7508-status to fail due
to mixed line endings in the output of git status (which calls git-submodule).

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>

git-submodule.sh

@@ -742,12 +742,16 @@ cmd_summary() {
 	done |
 	if test -n "$for_status"; then
 		if [ -n "$files" ]; then
-			echo "# Submodules changed but not updated:"
+			status_msg="# Submodules changed but not updated:"
 		else
-			echo "# Submodule changes to be committed:"
+			status_msg="# Submodule changes to be committed:"
 		fi
-		echo "#"
-		sed -e 's|^|# |' -e 's|^# $|#|'
+		status_sed=$(sed -e 's|^|# |' -e 's|^# $|#|')
+		cat <<EOF
+$status_msg
+#
+$status_sed
+EOF
 	else
 		cat
 	fi