Fix warnings due to missing const

(cherry picked from commit open-mpi/ompi@2c51faa)

Author: Rolf vandeVaart

ompi/mca/coll/cuda/coll_cuda.h

@@ -2,7 +2,7 @@
  * Copyright (c) 2014      The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
- * Copyright (c) 2014      NVIDIA Corporation.  All rights reserved.
+ * Copyright (c) 2014-2015 NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -39,33 +39,33 @@ int mca_coll_cuda_module_enable(mca_coll_base_module_t *module,
                                 struct ompi_communicator_t *comm);
 
 int
-mca_coll_cuda_allreduce(void *sbuf, void *rbuf, int count,
+mca_coll_cuda_allreduce(const void *sbuf, void *rbuf, int count,
                         struct ompi_datatype_t *dtype,
                         struct ompi_op_t *op,
                         struct ompi_communicator_t *comm,
                         mca_coll_base_module_t *module);
 
-int mca_coll_cuda_reduce(void *sbuf, void *rbuf, int count,
+int mca_coll_cuda_reduce(const void *sbuf, void *rbuf, int count,
                          struct ompi_datatype_t *dtype,
                          struct ompi_op_t *op,
                          int root,
                          struct ompi_communicator_t *comm,
                          mca_coll_base_module_t *module);
 
-int mca_coll_cuda_exscan(void *sbuf, void *rbuf, int count,
+int mca_coll_cuda_exscan(const void *sbuf, void *rbuf, int count,
                          struct ompi_datatype_t *dtype,
                          struct ompi_op_t *op,
                          struct ompi_communicator_t *comm,
                          mca_coll_base_module_t *module);
 
-int mca_coll_cuda_scan(void *sbuf, void *rbuf, int count,
+int mca_coll_cuda_scan(const void *sbuf, void *rbuf, int count,
                        struct ompi_datatype_t *dtype,
                        struct ompi_op_t *op,
                        struct ompi_communicator_t *comm,
                        mca_coll_base_module_t *module);
 
 int
-mca_coll_cuda_reduce_scatter_block(void *sbuf, void *rbuf, int rcount,
+mca_coll_cuda_reduce_scatter_block(const void *sbuf, void *rbuf, int rcount,
                                    struct ompi_datatype_t *dtype,
                                    struct ompi_op_t *op,
                                    struct ompi_communicator_t *comm,

ompi/mca/coll/cuda/coll_cuda_allreduce.c

@@ -27,7 +27,7 @@
  *	Returns:	- MPI_SUCCESS or error code
  */
 int
-mca_coll_cuda_allreduce(void *sbuf, void *rbuf, int count,
+mca_coll_cuda_allreduce(const void *sbuf, void *rbuf, int count,
                         struct ompi_datatype_t *dtype,
                         struct ompi_op_t *op,
                         struct ompi_communicator_t *comm,

ompi/mca/coll/cuda/coll_cuda_exscan.c

@@ -19,7 +19,7 @@
 #include "opal/datatype/opal_convertor.h"
 #include "opal/datatype/opal_datatype_cuda.h"
 
-int mca_coll_cuda_exscan(void *sbuf, void *rbuf, int count,
+int mca_coll_cuda_exscan(const void *sbuf, void *rbuf, int count,
                          struct ompi_datatype_t *dtype,
                          struct ompi_op_t *op,
                          struct ompi_communicator_t *comm,

ompi/mca/coll/cuda/coll_cuda_reduce.c

@@ -27,7 +27,7 @@
  *	Returns:	- MPI_SUCCESS or error code
  */
 int
-mca_coll_cuda_reduce(void *sbuf, void *rbuf, int count,
+mca_coll_cuda_reduce(const void *sbuf, void *rbuf, int count,
                      struct ompi_datatype_t *dtype,
                      struct ompi_op_t *op,
                      int root, struct ompi_communicator_t *comm,

ompi/mca/coll/cuda/coll_cuda_reduce_scatter_block.c

@@ -31,7 +31,7 @@
  *     up at some point)
  */
 int
-mca_coll_cuda_reduce_scatter_block(void *sbuf, void *rbuf, int rcount,
+mca_coll_cuda_reduce_scatter_block(const void *sbuf, void *rbuf, int rcount,
                                    struct ompi_datatype_t *dtype,
                                    struct ompi_op_t *op,
                                    struct ompi_communicator_t *comm,

ompi/mca/coll/cuda/coll_cuda_scan.c

@@ -26,7 +26,7 @@
  *	Accepts:	- same arguments as MPI_Scan()
  *	Returns:	- MPI_SUCCESS or error code
  */
-int mca_coll_cuda_scan(void *sbuf, void *rbuf, int count,
+int mca_coll_cuda_scan(const void *sbuf, void *rbuf, int count,
                        struct ompi_datatype_t *dtype,
                        struct ompi_op_t *op,
                        struct ompi_communicator_t *comm,