[fedora-arm] armv7hl requirements

[DJ Delorie]

> Believe me I am painfully aware of that. I have got gcc to compile on
> one of the ARM boxes in mock. Using koji on the same device it doesn't
> compile and I have no idea why so its still not a guarantee it seems,
> very unfortunately!

I've build gcc RPMs on my pandaboard.  Try overriding the -j2 to -j1,
my board was running out of memory during certain key steps in the
build.