Fix shared object on x86-64 Linux having executable stack ELF flag enabled #481
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Our older blake3 assembly files did not specify disabling of executable stack when using GCC which was now causing build issues on Arch linux.
Fixed via https://github.com/BLAKE3-team/BLAKE3/blob/adbf07d/c/blake3_avx2_x86-64_unix.S#L2
Isolated CI to only rebuild x86-64 Linux for this purpose as we don't want to mutate anything else unnecessarily as we move over to PoS2.