Simplify Xcode CI / Docs

[scoopr]

I happened to stumble upon the C_COMPILER_LAUNCHER Xcode attribute,
which fits the bill perfectly, so use that instead.

[scoopr]

Meh, just as we got the #2257 merged, some Xcode warning exposes that it supports C_COMPILER_LAUNCHER attribute, which is a lot simpler than the wrapper script

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 40.62%. Comparing base (0cc0c62) to head (dc91279).
Report is 81 commits behind head on main.

Files with missing lines	Patch %	Lines
src/compiler/gcc.rs	0.00%	1 Missing and 1 partial ⚠️
src/compiler/compiler.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2266      +/-   ##
==========================================
+ Coverage   30.91%   40.62%   +9.71%     
==========================================
  Files          53       54       +1     
  Lines       20112    20734     +622     
  Branches     9755     9637     -118     
==========================================
+ Hits         6217     8423    +2206     
- Misses       7922     8148     +226     
+ Partials     5973     4163    -1810     

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[scoopr]

Aha, but actually now it enables the response file use, so that needs to be disabled, I was a bit hasty on this PR, it needs a bit more work to be correct.

[scoopr]

Alright, when using C_COMPILER_LAUNCHER, instead of wrapper script for CC, it seems to be passing a bit more flags (as it knows the compiler better), So I added it to passthrough the -ivfstatcache path. Also noticed a single -x objective-c++-header from my project, so went ahead and added that as supported too.

I think it is much better like this.

[scoopr]

Just a friendly poke, was there any concerns here?

[sylvestre]

nope, thanks for the ping :)