bpo-35186: Remove "built with" comment in setup.py upload (GH-10414)

platform.dist() is deprecated and slated for removal in Python 3.8. The
upload command itself should also not be used to upload to PyPI, but
while it continues to exist it should not use deprecated functions.
diff --git a/Lib/distutils/command/upload.py b/Lib/distutils/command/upload.py
index 32dda35..613ea71 100644
--- a/Lib/distutils/command/upload.py
+++ b/Lib/distutils/command/upload.py
@@ -121,14 +121,8 @@
             'requires': meta.get_requires(),
             'obsoletes': meta.get_obsoletes(),
             }
-        comment = ''
-        if command == 'bdist_rpm':
-            dist, version, id = platform.dist()
-            if dist:
-                comment = 'built for %s %s' % (dist, version)
-        elif command == 'bdist_dumb':
-            comment = 'built for %s' % platform.platform(terse=1)
-        data['comment'] = comment
+
+        data['comment'] = ''
 
         if self.sign:
             data['gpg_signature'] = (os.path.basename(filename) + ".asc",