promoted pysetup3 to a top-level script

Makefile.pre.in

@@ -888,6 +888,8 @@ bininstall: altbininstall
 	(cd $(DESTDIR)$(BINDIR); $(LN) -s pydoc$(VERSION) pydoc3)
 	-rm -f $(DESTDIR)$(BINDIR)/2to3
 	(cd $(DESTDIR)$(BINDIR); $(LN) -s 2to3-$(VERSION) 2to3)
+	-rm -f $(DESTDIR)$(BINDIR)/pysetup3
+	(cd $(DESTDIR)$(BINDIR); $(LN) -s pysetup$(VERSION) pysetup3)
 
 # Install the manual page
 maninstall:

setup.py

@@ -1889,7 +1889,7 @@ def main():
           # check the PyBuildScripts command above, and change the links
           # created by the bininstall target in Makefile.pre.in
           scripts = ["Tools/scripts/pydoc3", "Tools/scripts/idle3",
-                     "Tools/scripts/2to3"]
+                     "Tools/scripts/2to3", "Tools/scripts/pysetup3"]
         )
 
 # --install-platlib