yade will no longerbe built on armel/armhf

[Riku Voipio <riku.voipio@iki.fi>]

Hi,

yade takes obscene amounts of RAM during builds, causing excessive build
times due to swapping on armel/armhf buildds. Since it does not seem to
be a package likely to be run ARM machines in near future, we have
disabled building it for now.

Riku