Most likely due to the switch to binutils-2.17, emacs crashes with SIGBUS
at the loadup build step on sparc64, because it puts the section headers
at an unaligned address.
I am not sure whether this is the True Proper Fix. Also, other strict
architectures ought to be affected too. But let's at least provide
a working emacs package for sparc64 users at c2k15.
To be revisited laterwith feedback from upstream.
Problem reported by sthen/dlg/naddy.
8cbca44584