[packman] Build host memory limits

[Guido Berhoerster]

Hi,

Games/mame randomly fails to build, apparently it is runs out of
memory during linking. I tried adding build job constraints
requiring more that 1500M of physical memory, however the jobs
now stay in scheduled state forever, so I guess there are no
xen/kvm worker vms configured with more the 1GB of memory?
-- 
Guido Berhoerster