Mark as x86-specific.

The error that I was seeing was:

sysutils/hpacucli dependency on misc/compat4x has wrong PKGNAME of
'compat4x-i386' but should be 'compat4x-armv7'

This port dates from an era so long ago that the assumption was that
"32-bit" => "i386". I would be very surprised if any of this antique
code was still in use; it is certainly irrelevant for 32-bit arm.