Changelog for rust-std-bootstrap-1_21-1.21.0-lp150.3.1.x86_64.rpm :

* Mon May 14 2018 mmanu84AATToutlook.de- Add _constraints file to avoid build failure for ppc64 and ppc64le
* Fri Oct 20 2017 luke.nukem.jonesAATTgmail.com- Create 1.21 bootstrap for std