Remove traces of Mac OS 9 support, again (#9508).

This was done in r80805 (#7908) and erroneously brought back by the
distutils revert.  This commit removes more code than the original,
which was uncomplete.  There is no NEWS entry, like in r80805.

Lib/distutils/file_util.py

@@ -130,15 +130,6 @@ def copy_file(src, dst, preserve_mode=1, preserve_times=1, update=0,
     if dry_run:
         return (dst, 1)
 
-    # On Mac OS, use the native file copy routine
-    if os.name == 'mac':
-        import macostools
-        try:
-            macostools.copy(src, dst, 0, preserve_times)
-        except os.error as exc:
-            raise DistutilsFileError(
-                  "could not copy '%s' to '%s': %s" % (src, dst, exc.args[-1]))
-
     # If linking (hard or symbolic), use the appropriate system call
     # (Unix only, of course, but that's the caller's responsibility)
     elif link == 'hard':