misc: merge runtime-ffi repository

[Wodann]

Merges https://github.com/mun-lang/runtime-ffi into https://github.com/mun-lang/mun, allowing us to archive the former and have a single CI pipleine

[baszalmstra]

Will you fix the CI in this PR? Or at a later stage?

You could make the CMake such that if no path is specified for the binaries, than you build them? That way you can always use this repository and we don't have to update the repositories with the binaries! See SixtyFPS for a way how.

[Wodann]

Yeah, I got the notification that CI failed but didn't have time to look at it yet. Will fix!

[codecov]

Codecov Report

Merging #352 (5ea9806) into main (37add09) will not change coverage.
The diff coverage is 43.75%.

❗ Current head 5ea9806 differs from pull request most recent head 846919b. Consider uploading reports for the commit 846919b to get more accurate results

@@           Coverage Diff           @@
##             main     #352   +/-   ##
=======================================
  Coverage   82.54%   82.54%           
=======================================
  Files         264      264           
  Lines       15294    15294           
=======================================
  Hits        12624    12624           
  Misses       2670     2670           

Impacted Files	Coverage Δ
crates/mun_codegen/src/code_gen/symbols.rs	79.14% <0.00%> (ø)
crates/mun_codegen/src/ir.rs	41.66% <ø> (ø)
crates/mun_codegen/src/ir/dispatch_table.rs	80.95% <ø> (ø)
crates/mun_codegen/src/ir/ty.rs	75.19% <0.00%> (ø)
crates/mun_codegen/src/value/function_value.rs	83.33% <50.00%> (ø)
crates/mun_codegen/src/ir/body.rs	81.53% <66.66%> (ø)
crates/mun_codegen/src/intrinsics/macros.rs	100.00% <100.00%> (ø)
crates/tools/src/runtime_capi.rs	100.00% <100.00%> (ø)
... and 3 more

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[Wodann]

CI is fixed. Ready to review, @baszalmstra

[baszalmstra]

Can you rebase on main? There are still a few LLVM12 changes in here.