Adds alternate download approach for nuget.exe
Fall back to git.exe if no Python is found. (#2739)
Also check whether git.exe is on PATH if it will be used.
Add support for HOST_PYTHON variable.
Clear internal environment variables used in find_python.bat
Use HOST_PYTHON as the actual Python if it is recent enough.
Adds HOST_PYTHON variable to AppVeyor configuration
This will allow for centralized management of the Codecov config to prevent skew as well as easier management going forward.
Closes python/core-workflowGH-81.
(cherry picked from commit 11ffb4543b)
Steve Dower
Zachary Ware
Brett Cannon
Senthil Kumaran