autopilot: disable run script not supported by riscv

- libc and nic driver are currently not available on RISC-V

issue #4021

repos/ports/run/verify.run

@@ -1,3 +1,8 @@
+if {[get_cmd_switch --autopilot] && [have_board riscv_qemu]} {
+	puts "Autopilot mode is not supported on this platform."
+	exit 0
+}
+
 create_boot_directory
 
 import_from_depot [depot_user]/src/[base_src] \