[runtime-cxxmodules] Generate std_darwin.modulemap from active SDK #18235
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This Pull request:
Dynamically extract and wrap the system modulemap from the active
SDK in a top-level 'std' module
Also remove 'std_ctype_h' module to break cyclic dependencies.
Fixes #18213 for good, in a potentially future proof way.
Changes or fixes:
Checklist:
This PR fixes #