branches: 1.2.2; 1.2.4; 1.2.12; 1.2.16;
Modularize ualea(4).

Unclear why we have a separate xyz.ioconf for module and XYZ.ioconf
for rump component, but at least xyz_modcmd obviates the need for
xyz_component.c (though evidently the latter could have been replaced
anyway by RUMP_COMPONENT=ioconf in the rump component Makefile).

New rndsource driver for Araneus Alea II TRNG USB devices.

Disabled by default in x86/GENERIC and usbdevices.config pending
review and testing without rump ugenhc in the way, but enabled in
x86/ALL for compile-testing.

(Hi gson! Finally found a round tuit in my pocket, next to a certain
rectangular one.)