fixing up an armhf screwup

[Gene Heskett <gheskett@shentel.net>]

I had, in a failed attempt to install what was supposed to be a fully 
preemptable kernel on a pi3 that turned out to be a low-latncy desktop 
and truly horrible latency's. accidently filled up the /boot partition 
on the pi3's u-sd card, and my cleanups were a little enthusiastic, 
nuking the fixup* stuff too.

So since I have that .iso here, how do I mount it to copy those 5 or so 
files out of it and back to this card?  I've not used the -oloop option 
in a decade and have long since forgot how.

Cheers, Gene Heskett
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