Fix mpi include order

source/adios2/engine/sst/SstReader.h

@@ -13,9 +13,10 @@
 
 #include <iostream> //std::cout << Needs to go
 
-#include "adios2/toolkit/sst/sst.h"
 #include <mpi.h>
 
+#include "adios2/toolkit/sst/sst.h"
+
 #include "adios2/core/Engine.h"
 #include "adios2/core/IO.h"
 

source/adios2/engine/sst/SstWriter.h

@@ -14,6 +14,8 @@
 #include <iostream> //std::cout must be removed, only used for hello example
 #include <unistd.h> //sleep must be removed
 
+#include <mpi.h>
+
 #include "adios2/toolkit/sst/sst.h"
 
 #include "adios2/ADIOSConfig.h"