Commits on Feb 7, 2022

1. Rerun bootstrap's build script when RUSTC changes …

   Previously, rustbuild would give strange errors if you tried to reuse the same build directory under two names:
   
   ```
   $ mkdir tmp && cd tmp
   $ ../x.py check
   Building rustbuild
       Finished dev [unoptimized] target(s) in 35.27s
   Checking stage0 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   ^C
   $ cd ..
   $ mv tmp/build build
   $ ./x.py check
   Building rustbuild
      Compiling bootstrap v0.0.0 (/home/jnelson/rust-lang/rust/src/bootstrap)
       Finished dev [unoptimized] target(s) in 11.18s
   
   failed to execute command: "/home/jnelson/rust-lang/rust/tmp/build/x86_64-unknown-linux-gnu/stage0/bin/rustc" "--target" "x86_64-unknown-linux-gnu" "--print" "target-libdir"
   error: No such file or directory (os error 2)
   ```
   
   This fixes the error. Reusing the same build directory is useful if you want to test path-things in
   bootstrap itself, without having to recompile it each time.
   
   For good measure, this also reruns the build script when PATH changes.

   

   jyn514 committed Feb 7, 2022
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