mesa-gears.run: add missing rtc config

Without the 'rtc' configuration, the gears won't move.

repos/libports/run/mesa-gears.inc

@@ -5,9 +5,11 @@ set demo_caps      200
 
 set demo_config {
 <config ld_verbose="true">
-	<libc stdout="/dev/log" stderr="/dev/log"/>
+	<libc stdout="/dev/log" stderr="/dev/log" rtc="/dev/rtc" />
 	<vfs>
-		<dir name="dev"> <log/> </dir>
+		<dir name="dev">
+			<log/> <inline name="rtc">2000-01-01 00:00</inline>
+		</dir>
 	</vfs>
 </config>}