update libcuda.so find command to follow symlinks

Signed-off-by: Benjamin Kitor <bkitor@gigaio.com>

Author: BKitor

config/opal_check_cuda.m4

@@ -59,8 +59,8 @@ AC_ARG_WITH([cuda-libdir],
                             [Search for CUDA libraries in DIR])],
             [],
             [AS_IF([test -d "$with_cuda"],
-             [with_cuda_libdir=$(dirname $(find $with_cuda -name libcuda.so 2> /dev/null) 2> /dev/null)],
-             [with_cuda_libdir=$(dirname $(find /usr/local/cuda -name libcuda.so 2> /dev/null) 2> /dev/null)])
+             [with_cuda_libdir=$(dirname $(find -H $with_cuda -name libcuda.so 2> /dev/null) 2> /dev/null)],
+             [with_cuda_libdir=$(dirname $(find -H /usr/local/cuda -name libcuda.so 2> /dev/null) 2> /dev/null)])
             ])
 
 # Note that CUDA support is off by default.  To turn it on, the user has to