Fix build.rs

[rukai]

I described here that build.rs will always trigger a rebuild on the second build (but then settle after that) https://github.com/akubera/bigdecimal-rs/issues/105#issuecomment-1644976911 and this PR fixes that issue.

The fix is just to remove the line println!("cargo:rerun-if-changed={}", default_precision_rs_path.display()); This line doesnt make any sense because the path is an output not an input. We only want to rebuild if our inputs change not our outputs.

The line was originally introduced here: https://github.com/akubera/bigdecimal-rs/commit/b35a851246465f724fde83397ab257bbef48dd32 And then a workaround that missed the root cause was introduced here: https://github.com/akubera/bigdecimal-rs/pull/106/files

I also cleaned up the whole thing because it was way more complicated than it needed to be.

[codecov-commenter]

Codecov Report

Merging #110 (12860dd) into trunk (6e3c04a) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##            trunk     #110   +/-   ##
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  Coverage   76.86%   76.86%           
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  Files          11       11           
  Lines        2027     2027           
  Branches     2027     2027           
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  Hits         1558     1558           
  Misses         86       86           
  Partials      383      383           

[rukai]

did you rewrite history? This merge conflict makes no sense.

[rukai]

I fixed it somehow.

[akubera]

This looks good. Thanks.