The "correct" solution to this problem (makeBinaryWrapper fails to be
able to compile the binary wrapper when building a freebsd cross env) is
that makeBinaryWrapper should propagate or embed a reference to the
compiler. However, this causes build failures on musl, so this will have
to do for now.
Now that `buildEnv` is ready, always put `makeWrapper` in
`nativeBuildInputs`, rather than `buildInputs` or (worse) mucking around
with setup hooks by hand.
(C.f. #112276, which didn't catch these because the manual setup hook
sourcing is such a hack to being with!)
Fixes#114687
