Remove redundant __main__ blocks from packaging modules.

The one interface we commit to maintain is the run module
(a.k.a. the pysetup script).

Lib/packaging/create.py

@@ -674,7 +674,3 @@ def main():
     # program.write_setup_script()
     # packaging.util.cfg_to_args()
     program()
-
-
-if __name__ == '__main__':
-    main()

Lib/packaging/depgraph.py

@@ -224,6 +224,7 @@ def dependent_dists(dists, dist):
 
 
 def main():
+    # XXX move to run._graph
     from packaging.database import get_distributions
     tempout = StringIO()
     try:
@@ -267,7 +268,3 @@ def main():
     else:
         print('Supported option: -d [filename]')
         sys.exit(1)
-
-
-if __name__ == '__main__':
-    main()

Lib/packaging/install.py

@@ -527,12 +527,3 @@ def install(project):
             logger.info('%r conflicts with %s', project, ','.join(projects))
 
     return True
-
-
-def _main(**attrs):
-    if 'script_args' not in attrs:
-        attrs['requirements'] = sys.argv[1]
-    get_infos(**attrs)
-
-if __name__ == '__main__':
-    _main()