Issue #19649: On OS X, the same set of file names are now installed
in bin directories for all configurations: non-framework vs framework,
and single arch vs universal builds.  pythonx.y-32 is now always
installed for 64-bit/32-bit universal builds.  The obsolete and
undocumented pythonw* symlinks are no longer installed anywhere.
Issue #19553: PEP 453 - "make install" and "make altinstall" now install or
upgrade pip by default, using the bundled pip provided by the new ensurepip
module.  A new configure option, --with-ensurepip[=upgrade|install|no], is
available to override the default ensurepip "--upgrade" option.  The option
can also be set with "make [alt]install ENSUREPIP=[upgrade|install\no]".