This version comes with two fixes.

1/ Fix a warning due to the visibility attribute needed by Theano.
We changed const char* CNMEM_API to const char CNMEM_API* in the
declaration of cnmemGetErrorString to have the attribute between
char and star. It fixes the warning.

2/ Fix a compilation issue with CUDA 5.0 due to the missing
cudaStreamGetFlags function. It is #defined out when the Runtime
is less than 5.5 (5050 version).