librealsense,python3Packages.pyrealsense2: refactor to add cudaSupport and python bindings

pkgs/top-level/all-packages.nix

@@ -17710,6 +17710,14 @@ in
 
   librealsense = callPackage ../development/libraries/librealsense { };
 
+  librealsenseWithCuda = callPackage ../development/libraries/librealsense {
+    cudaSupport = true;
+  };
+
+  librealsenseWithoutCuda = callPackage ../development/libraries/librealsense {
+    cudaSupport = false;
+  };
+
   libsass = callPackage ../development/libraries/libsass { };
 
   libsepol = callPackage ../os-specific/linux/libsepol { };

pkgs/top-level/python-packages.nix

@@ -2618,6 +2618,21 @@ in {
 
   pyhs100 = callPackage ../development/python-modules/pyhs100 { };
 
+  pyrealsense2 = toPythonModule (pkgs.librealsense.override {
+    enablePython = true;
+    pythonPackages = self;
+  });
+
+  pyrealsense2WithCuda = toPythonModule (pkgs.librealsenseWithCuda.override {
+    enablePython = true;
+    pythonPackages = self;
+  });
+
+  pyrealsense2WithoutCuda = toPythonModule (pkgs.librealsenseWithoutCuda.override {
+    enablePython = true;
+    pythonPackages = self;
+  });
+
   pytest = if isPy3k then self.pytest_5 else self.pytest_4;
 
   pytest_5 = callPackage ../development/python-modules/pytest {