Better windows introspection
Better windows introspection

 - If `SIGKILL` missing, try `-D_POSIX`
 - If windows (CMake `WIN32` for 32 & 64 bit windows) and `I_MPI_VERSION`
   `#define`d then pass `-DUSE_GCC` to adjust MPI type-defs

sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays