meta-riscv: building curl, "undefined reference to '__atomic_exchange_1'

Robert P. J. Day

on admittedly unsupported ubuntu 22.04 platform but it's clear this
is a known issue as it's pretty much identical to what one reads here:

the explanation being that, "not every atomic operation is currently
supported by GCC on RISC-V."

oddly, building a riscv64 core-image-minimal once upon a time on
fedora worked just fine, so i'm assuming a difference in gcc versions
is what is causing this.

what is the recommended workaround for this?


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