Apply patch updating wx.lib.plot, closes #16590

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@78006 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Revert back to a single scheduler for the dist builds

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@78007 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add a reminder about gtk3 builds

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@78008 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775