To correctly find the implementation of `pidfd_open` - which was
introduced in glibc 2.36 - an additional `#include` is needed. The newly
introduced patch adds that.
Failing Hydra build: https://hydra.nixos.org/build/214432977
checkInputs used to be added to nativeBuildInputs. Now we have
nativeCheckInputs to do that instead. Doing this treewide change allows
to keep hashes identical to before the introduction of
nativeCheckInputs.
