argv-array: implement argv_array_pushv()

When we have a null-terminated array, it would be useful to convert it
or append it to an argv_array for further manipulation.

Implement argv_array_pushv() which will push a null-terminated array of
strings on to an argv_array.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

argv-array.c

@@ -49,6 +49,12 @@ void argv_array_pushl(struct argv_array *array, ...)
 	va_end(ap);
 }
 
+void argv_array_pushv(struct argv_array *array, const char **argv)
+{
+	for (; *argv; argv++)
+		argv_array_push(array, *argv);
+}
+
 void argv_array_pop(struct argv_array *array)
 {
 	if (!array->argc)