Small fix for case where no libcuda.so.1 is found.

This commit was SVN r32461.

opal/mca/common/cuda/common_cuda.c

@@ -440,6 +440,7 @@ int mca_common_cuda_stage_one_init(void)
         errmsg = opal_argv_join(errmsgs, '\n');
         opal_show_help("help-mpi-common-cuda.txt", "dlopen failed", true,
                        errmsg);
+        ompi_mpi_cuda_support = 0;
     }
     opal_argv_free(errmsgs);
     free(errmsg);

opal/mca/common/cuda/help-mpi-common-cuda.txt

@@ -168,6 +168,10 @@ MPI developers.
 The library attempted to open the following supporting CUDA libraries, 
 but each of them failed.  CUDA-aware support is disabled.
 %s
+If you are not interested in CUDA-aware support, then run with 
+--mca mpi_cuda_support 0 to suppress this message.  If you are interested
+in CUDA-aware support, then try setting LD_LIBRARY_PATH to the location
+of libcuda.so.1 to get passed this issue.
 #
 [dlsym failed]
 An error occurred while trying to map in the address of a function.