Integrate the latest version of CNMEM

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).

Integrate the latest version of CNMEM
58944771 · Julien Demouth · Frederic · 2dfec943 · 58944771 · 58944771
--- a/theano/sandbox/cuda/cnmem.cpp
+++ b/theano/sandbox/cuda/cnmem.cpp
@@ -381,6 +381,8 @@ public:
        mStream = stream; 
 #ifdef CUDA_API_PER_THREAD_DEFAULT_STREAM
        mIsStreamBlocking = false;
+#elif CUDART_VERSION < 5050
+        mIsStreamBlocking = true;
 #else
        unsigned flags = 0;
        CNMEM_CHECK_CUDA(cudaStreamGetFlags(mStream, &flags));

--- a/theano/sandbox/cuda/cnmem.h
+++ b/theano/sandbox/cuda/cnmem.h
@@ -253,7 +253,7 @@ cnmemStatus_t CNMEM_API cnmemPrintMemoryState(FILE *file, cudaStream_t stream);
 /**
 * \brief Converts a cnmemStatus_t value to a string.
 */
-const char* CNMEM_API cnmemGetErrorString(cnmemStatus_t status);
+const char CNMEM_API * cnmemGetErrorString(cnmemStatus_t status);
 /* ********************************************************************************************* */