[Debian-med-packaging] Bug#813559: ngs-sdk: FTBFS: most platforms explicitly unsupported

[Edmund Grimley Evans]

It was very easy to "build" this package on arm64. All I did was:

* Modify each konfigure.perl to set $BITS = 64 instead of
  die "unrecognized Architecture '$ARCH'".

* Provide ngs-sdk/ngs/unix/aarch64/atomic32.h containing stubs.

Now, if you wanted the package to actually work, you would presumably
provide proper implementations in atomic32.h. They could use inline
assembler, like in x86_64/atomic32.h, but perhaps it would be better
to use GCC built-ins.