Since sysconfig.get_python_inc() now works when building in a directory other than the source directory, simplify the test code in test_sysconfig.py.
Since sysconfig.get_python_inc() now works when building in a
directory other than the source directory, simplify the test code in
test_sysconfig.py.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator