[debian-mysql] Bug#933151: mariadb-10.3: FTBFS on riscv64

[Otto Kekäläinen]

After uploading mariadb-10.5 1:10.5.5-1 to Debian the build still
fails with these:

/usr/bin/ld: /usr/include/c++/10/bits/atomic_base.h:464: undefined
reference to `__atomic_compare_exchange_1'

The odd thing is that an identical build on Ubuntu Groovy passes OK:
https://launchpadlibrarian.net/499652421/buildlog_ubuntu-groovy-riscv64.mariadb-10.5_1%3A10.5.5-1~ubuntu20.10.1~1601274184.7ad164279+master_BUILDING.txt.gz