Dropping use of super() in BuildFortranThenExt.
Dropping use of super() in BuildFortranThenExt.

It cannot be used in Python 2.7 because the parent class
is an old-style class.

See failure: https://circleci.com/gh/dhermes/bezier/682

dhermes/bezier,dhermes/bezier,dhermes/bezier