Add ROS_ETC_DIR to activate.bat

Author: Tobias-Fischer

vinca/templates/activate.bat.in

@@ -10,4 +10,5 @@
 @@call "%CONDA_PREFIX%\Library\local_setup.bat"
 @@set PYTHONHOME=
 @@set "ROS_OS_OVERRIDE=robostack:win64"
+@@set "ROS_ETC_DIR=%CONDA_PREFIX%\Library\etc\ros"