zig.h: Add new zig_gcc macro to indicate GCC.

As opposed to "GNU C" (zig_gnuc) which includes Clang.

This addresses #22890 but does not fix it until a zig1.wasm update.
d7f9b5a661Alex Rønne Petersen committed on 2/15/2025, 11:21:51 PMparente5174c7
1 file changedLine totals unavailable