Update --version option to print 32/64-bit build and time_t size

Update --version option to print 32/64-bit build and time_t size

Use only sizeof() and not SIZEOF_VOID_P/SIZEOF_TIME_T because these
macros could have invalid values in some macOS fat builds (See commit
170cbc8c6d484387ec7ae19ef9f4bd14dd0845e7).

This method should be future proof.

With this change we know:
whether this is a 32-bit or 64-bit build;
whether the time_t size is 32-bit or 64-bit.

[skip ci]