Fixes cl.exe not being seen on Windows

comp, out and err evaluate to: False b"nvcc fatal : Cannot find compiler 'cl.exe' in PATH\r\n" b'' So I found it necessary to add the --compiler-bindir flag to the source, in order to actually use cudnn.

Fixes cl.exe not being seen on Windows
f52b6e42 · Andrea · dfb27303 · f52b6e42
--- a/theano/sandbox/cuda/dnn.py
+++ b/theano/sandbox/cuda/dnn.py
@@ -69,6 +69,8 @@ if ((err = cudnnCreate(&_handle)) != CUDNN_STATUS_SUCCESS) {
                params.append("-I" + config.dnn.include_path)
            if config.dnn.library_path:
                params.append("-L" + config.dnn.library_path)
+            if config.nvcc.compiler_bindir:
+                params.extend(['--compiler-bindir', config.nvcc.compiler_bindir])
            # Do not run here the test program. It would run on the
            # default gpu, not the one selected by the user. If mixed
            # GPU are installed or if the GPUs are configured in