[3.6.x]
- [c] Modified kvec.h used by SkeletonBinary.c to use Spine's MALLOC/FREE macros. That way there's only one place 
  to inject custom allocators (extension.h) https://github.com/EsotericSoftware/spine-runtimes/commit/c2cfbc6cb8709daa082726222d558188d75a004f