dev: ignore generated cufile.pyx (#977)

Author: cpcloud

.gitignore

@@ -27,6 +27,7 @@ cuda_bindings/cuda/bindings/_bindings/cyruntime_ptds.pxd
 cuda_bindings/cuda/bindings/_bindings/cyruntime_ptds.pyx
 cuda_bindings/cuda/bindings/_bindings/cynvrtc.pxd
 cuda_bindings/cuda/bindings/_bindings/cynvrtc.pyx
+cuda_bindings/cuda/bindings/_internal/cufile.pyx
 cuda_bindings/cuda/bindings/_internal/nvjitlink.pyx
 cuda_bindings/cuda/bindings/_internal/nvvm.pyx
 cuda_bindings/cuda/bindings/_lib/utils.pxd