Blender Git Loki

Fix for invalid void* to typed pointer assignment in bmesh when used in C++ code.

C++ does not allow the assignment of a void pointer to a typed pointer without
explicit casting. Since we use a generic macro in bmesh for iterators we only
ever get a void* back and cannot cast it to the target type. However, casting
the target to a void* as well solves that issue.

This tweak is #ifdef'd to be used in C++ code only.