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.
An advance in shellcheck started causing new failures here, which
inspired me to think a little more lucidly and realize it's a bad
idea to shellcheck something that isn't maintainer-developed. The
outcomes are all annoying timewasters. :[
