Fix #23143 - importC: translate function alias macros to aliases#23214
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A `#define ID identifier` whose body is a single identifier naming a function (e.g. `#define mpz_init __gmpz_init` in gmp.h) was abandoned, leaving the macro name undefined in D. Translate such object-like macros to `alias ID = identifier;` so they resolve to the function. Restricted to identifiers that name a function declared in the same translation unit: - aliasing an undefined identifier would error eagerly, which system headers would trigger by #define-ing keywords to compiler builtins (e.g. `#define complex _Complex`); - aliasing a type or variable would shadow declarations with a conflicting meaning (e.g. C's `complex`, glibc's `#define stdin stdin`). Self-referential macros are skipped as well. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Closes #23143
Recognize
#define ID identifierand define an alias ifidentifierwas seen before.