[PATCH] Add more value barriers to avoid compiler induced side channels
The paper https://arxiv.org/pdf/2410.13489 claims that on specific architectures Clang and GCC may introduce jumps here. The donna128 issues only affect 32-bit processors, which explains why we would not see it in the x86-64 valgrind runs.
The GHASH leak would seem to be generic but the authors only observed it on RISC-V.
[PATCH] Remove code relying on Python distutils This was just used to check if Sphinx supports concurrency, but Sphinx is also barely faster with 1 core vs 32, so it hardly matters.
