Ansible request for gcc installs on riscv64

[sxa]

Please put the name of the software product (and affected platforms if relevant) in the title of this issue

Delete as appropriate from this list:

• Bug in ansible playbook

Details:

When running the playbooks recently it seemed to be trying to install our custom gcc when the playbooks are run on riscv64 which isn't available. This issue is to track checking the conditions and making sure it doesn't try to do anything it shouldn't.

(Also related, we should ideally try and produce a devkit for use on riscv64. I did do an initial test of a gcc build but didn't get it working)

[sxa]

gcc needs some special options to build on riscv64 as the defaults don't work.
This will likely be superceded by a devkit build, although since the versions of Fedora are somewhat "sparse" I'm going to investigate doing this with the fc27RPMs from http://secondary.fedoraproject.org/pub/alt/risc-v/RPMS