fix: emit and link bitcode files instead of obj does not work on MacOS

[baszalmstra]

This reverts commit 0736239 or MR #258 . It doesnt work when generating MacOS binaries (build actually failed..).

For MacOS we would have to generate object files so we would have two code paths. Id rather then just use object files for all platforms.

[codecov]

Codecov Report

Merging #261 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #261   +/-   ##
=======================================
  Coverage   78.74%   78.75%           
=======================================
  Files         215      215           
  Lines       12853    12857    +4     
=======================================
+ Hits        10121    10125    +4     
  Misses       2732     2732           

Impacted Files	Coverage Δ
crates/mun_codegen/src/code_gen.rs	100.00% <ø> (ø)
crates/mun_codegen/src/code_gen/module_builder.rs	75.00% <100.00%> (+1.31%)	⬆️
crates/mun_codegen/src/code_gen/object_file.rs	100.00% <100.00%> (ø)

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