Rework the #ifndef WX_PURE so that paste_all_turtles() is called
when compiling for non-Windows platforms (which was the entire purpose of the previous change to make it take a wxDC, instead of an HDC). So now the turtle appears on GNU/Linux.
Authored by: david_costanzo 2016-03-13
Parent: [r4030]
Child: [r4032]
