[PATCH] Expose custom MC-JIT memory allocation through the C API

[Rafael Espíndola]

> 2.       We could put a version number in the structure.  If we did that, we
> could arguably even change the signatures of functions in future versions if
> there were a backward compatible way to call older versions of the same
> functions.

We probably don't need this much. Only released APIs are considered
stable. Since 3.3 just branched, we have all of the 3.4 cycle to
stabilize this.

Cheers,
Rafael