Check additional include directories for SSL
Don't build modules that are linked into the Python binary statically
Factored out the detection of Tkinter out into a method, since it's
the most complicated module to set up
Simplify the logic for detecting Tkinter
* Uncomment the xreadlines module
* The Tcl/Tk detection code doesn't need to worry about pre-8.0 versions
* Fix some debugging changes (not running ar, a commented-out line)