Comment # 5 on bug 974800 from Dirk Mueller

For gcc5 we're deleting the constraints file as it can never be fulfilled.
there is currently no way to create armv7 build workers with more than ~ 1GB of
RAM (as the tota l guest including qemu needs to fit into the 32bit 2GB limit
on the host). 

The gcc6 package builds just fine on armv7 without the constraints, as we only
build with -j1 or -j2 depending on the worker hardware. just expressing a
constraint of 700MB or so for armv7hl should always work (both gcc 5 and gcc 6)