vbox: use libc's 'gettimeofday()' function

Fixes #1363

repos/ports/run/virtualbox.run

@@ -111,9 +111,9 @@ append config {
 	<start name="virtualbox" priority="-2">
 		<resource name="RAM" quantum="448M"/>
 		<config vbox_file="test.vbox" vm_name="TestVM">
-			<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/> <rtc/> </dir>}
 
 append_if [expr $use_serial] config {
 					<dir name="dev"> <terminal/> </dir>}