[Issue 23078] New: importC: generated code shouldn't depend on druntime

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23078

          Issue ID: 23078
           Summary: importC: generated code shouldn't depend on druntime
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: kinke at gmx.net

All (or at least the vast majority) of the *.c tests in the testsuite should be
linkable without druntime, but aren't with DMD (unlike LDC), see the
https://github.com/dlang/dmd/pull/14056 CI failures.

TypeInfos seem to be emitted into the C object files, and some builtins like
`__builtin_va_end` are actually druntime imports (to be duplicated in
druntime's __builtins.di?).

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