[WinCairo] Windows Python 2.7 path length limitation
WinCairo port is using Windows Python 2.7 even though AppleWin port has been using Cygwin Python for long time.
There is an issue Windows Python 2.7 can't handle long path.
run-webkit-test (Bug 188092 comment 11)
Buildbot slave (Bug 192207 comment 2)
We have two workarounds:
1. Use Windows Python 3.6 or later
2. Use Cygwin Python 2.7
I think we need to update Buildbot (Bug 175056) for #1.
Python 3.6 is the right solution to move forward. +1 to this choice.