Merge branch 'davidanthoff-win-datatypes' into datatypes

merge windows support

Author: JaredCrean2

src/win_mpiconstants.jl

@@ -77,5 +77,8 @@ const MPI_PROBE = (:MPI_PROBE, "msmpi.dll")
 const MPI_COMM_FREE = (:MPI_COMM_FREE, "msmpi.dll")
 const MPI_GET_COUNT = (:MPI_GET_COUNT, "msmpi.dll")
 const MPI_TESTSOME = (:MPI_TESTSOME, "msmpi.dll")
+const MPI_TYPE_CREATE_STRUCT = (:MPI_TYPE_CREATE_STRUCT, "msmpi.dll")
+const MPI_TYPE_COMMIT = (:MPI_TYPE_COMMIT, "msmpi.dll")
+const MPI_WAIT = (:MPI_WAIT, "msmpi.dll")
 
 bitstype 32 CComm