feat(libzigc): add `wcstok` and reuse more `std.mem` code

* also makes `wcpncpy`/`wcsncpy` pad the buffer with zeroes as required
  by the standard
06d05decaeGasInfinity committed on 1/17/2026, 8:42:40 PMparent3d8b0e3
1 file changedLine totals unavailable