Linux: rethrow exceptions correctly (#115)

Author: letmaik

.github/scripts/test-windows.ps1

@@ -97,7 +97,7 @@ exec { python -m pip install -r dev-requirements.txt }
 
 # Install test helper package
 Push-Location test/win-dshow-capture
-exec { python -m pip install wheel }
+exec { python -m pip install wheel setuptools }
 exec { python -u setup.py bdist_wheel }
 python -m pip uninstall -y pyvirtualcam_win_dshow_capture
 ls dist\*cp${PYVER}*win*.whl | % { exec { python -m pip install $_ } }

pyvirtualcam/native_linux_v4l2loopback/virtual_output.h

@@ -130,7 +130,7 @@ class VirtualOutput {
             } catch (std::exception &ex) {
                 close(_camera_fd);
                 _camera_fd = -1;
-                throw ex;
+                throw;
             }
         };