start throwing error on labels too far for /disp8

While I'm doing this I might as well lay out a story I don't seem to
have told before in this commit log.

I translated Mu programs to Linux before I did so to bare metal like I
do in the top-level these days. The translator programs still run from
the linux/ directory. However they don't always have good error
messages. As long as I was translating to Linux this wasn't a huge deal
because I always translated Mu programs using the bootstrap translator
in linux/bootstrap/ -- which has great error messages. However,
linux/bootstrap/ can't build bare-metal programs because boot.subx uses
real-mode instructions that aren't supported. As a hack I created a
script called misc_checks that at least tries to run everything besides
boot.subx -- even though translation can never succeed. If I run it and
get to errors about unknown variables I know everything besides
boot.subx raised no errors.

Having labels too far in /disp8 args is is the single biggest reason we
need the misc_checks hack. Hopefully it's now obsolete.

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