Issue #10914: fix bogus memory management in Modules/getpath.c, leading to a possible crash when calling Py_SetPath()

arguments has the wrong type.  Patch by Nikita Vetoshkin.

Patch by Michael Henry.

Patch by Yves Dorfsman.

Close Issue 11570: Lib/test/test_distutils.py tries to mix 32 and 64 bits object files, doesn't obey LDFLAGS

ensure that it will be found regardless of the shell PATH. This ensures
that multiprocessing.cpu_count works on default installs of MacOSX.

Emphasize the ['x', 'y'] option for listing field names.  Remove PS2 prompts to make the examples cut-and-pasteable.