Add Recent Files menu option.

key (backtick/grave) or select button.

input.cpp

@@ -2182,6 +2182,15 @@ static void input_cb(struct input_event *ev, struct input_absinfo *absinfo, int
 							return;
 						}
 
+						// Recent Files menu
+						// FIXME: temporary pass through of select joypad button.  unsure of the best way to do this.
+						// updates here may require changes in menu.cpp to match the key mapping
+						if (ev->code == input[dev].mmap[SYS_BTN_SELECT] && !osd_event) {
+							struct input_event key_ev = *ev;
+							key_ev.code = KEY_GRAVE;
+							input_cb(&key_ev, 0, 0);
+						}
+
 						for (int i = 0; i < SYS_BTN_A; i++)
 						{
 							if (ev->code == input[dev].mmap[i])