Address todo for supporting clang resource dir for lite

[anutosh491]

Description

After emscripten-forge/recipes#2350 went in, we should be able to access clang resource dir headers to support 3rd party libs like xsimd and others.

Should go in after #309 through a rebase.

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.78%. Comparing base (97daaeb) to head (b942993).
⚠️ Report is 98 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #311   +/-   ##
=======================================
  Coverage   81.78%   81.78%           
=======================================
  Files          20       20           
  Lines         950      950           
  Branches       87       87           
=======================================
  Hits          777      777           
  Misses        173      173           

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