Bug#1019868: godot: ftbfs on riscv64 ("undefined reference to `__atomic_compare_exchange_1'")

[Petter Reinholdtsen]

[Bo YU]
> The patch attached is to fix the issue and I have tested it on my
> local real riscv64 hardware.

The armel architecture need -latomic too.  Might be others as well.  I
am testing a variant of this patch now to verify it work on armel too.
-- 
Happy hacking
Petter Reinholdtsen