Commits on Mar 29, 2023

1. Remove some rerun-if-env-changed lines from build.rs. …

   Now that we appear to have a known-working fix for #526, we can
   investigate relaxing the fix. If #526 reappears, we now have a
   known-working state we can quickly revert to.
   
   Reports in #562 and #575 are that having rerun-if-env-changed=RUSTC
   and rerun-if-env-changed=RUSTC_WRAPPER are triggering spurious rebuilds
   in some situations, so remove these. In theory, cargo should already be
   aware of these environment variables. In practice, there were reports of
   build failures which had the appearance of using an older version of
   rustc with build.rs output from a newer version of rustc, and it wasn't
   clear what was happening. But, it's possible that #563 fixes the issue
   properly. So let's try removing these rerun-if-env-changed lines, and
   see if the problem resurfaces.
   
   And, rerun-if-env-changed=TARGET is explicitly documented as being
   unnecessary [here].
   
   [here]: https://doc.rust-lang.org/cargo/reference/build-scripts.html

   

   sunfishcode committed Mar 29, 2023
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