Bug#971547: gcc-10: gm2 should be disabled for cross-builds in debian/rules.defs

[John Paul Adrian Glaubitz]

> On Oct 2, 2020, at 1:18 PM, Matthias Klose <d...@debian.org> wrote:
> 
> both gcc-10-cross and gcc-10-cross-ports are building ok. Not sure what you 
> are
> trying to do here.

Cross-building a native compiler using “sbuild —host=$ARCH”. That failed when 
linking gm2.

Adrian