MariaDB 10.5 fails to build on riscv64, atomics issue, help needed

[Otto Kekäläinen <otto@debian.org>]

Hello!

We have some issues with building MariaDB 10.5 for riscv64. The
libatomics in Ubuntu is patched, and the builds on Ubuntu Launchpad
riscv64 pass OK.

However Debian buildd riscv64 failed. There have been multiple
attempts at doing atomics in different ways but build is still
failing.

If somebody can help, please participate in the discussion in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=933151 or submit a
Merge Request at https://salsa.debian.org/mariadb-team/mariadb-10.5

Thanks!

- Otto

PS. I am not on list, so please reply to Debian#933515 and CC me.