Provide /dev/random in runtime for fetchurl

libcrypto transparently opens /dev/random to seed its PRNG or logs an
error if this fails.

repos/libports/run/fetchurl.run

@@ -58,6 +58,7 @@ append config {
 				</dir>
 				<dir name="dev">
 					<log/> <null/> <inline name="rtc">2000-01-01 00:00</inline>
+					<inline name="random">01234567890123456789</inline>
 				</dir>
 				<dir name="socket"> <lxip dhcp="yes"/> </dir>
 			</vfs>