Tkinter with cosmo_dlopen

[mochaaP]

• Get Tcl/Tk working in cosmopolitan libc build system (X11 & GDI variant, macOS ships its own .framework for this)
• Patch Python's _tkinter to use cosmo_dlopen
• Get cross-platform (X11/Cocoa/GDI) GUI

[mochaaP]

We might also try to get ctypes working with some magic, but I'm not very sure specifically how