packages: roms: boot: add --help option.

The resources/packages/roms/boot script already work with the "help"
argument, however most of the other scripts use --help, so for
consistency we need to add --help as well.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Acked-by: Adrien Bourmault <neox@gnu.org>

resources/packages/roms/boot

@@ -80,6 +80,10 @@ buildrom() {
 
 if [ $# -gt 0 ]; then
 	firstoption="${1}"
+	if [ "${firstoption}" = "--help" ]; then
+		help
+		exit 0
+	fi
 	if [ "${firstoption}" = "help" ]; then
 		help
 		exit 0