Simplify and speedup uses of Py_BuildValue():

* Py_BuildValue("(OOO)",a,b,c)  -->  PyTuple_Pack(3,a,b,c)
* Py_BuildValue("()",a)         -->  PyTuple_New(0)
* Py_BuildValue("O", a)         -->  Py_INCREF(a)
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index a2a692a..4a2fb58 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1161,7 +1161,7 @@
 	if (addr == NULL)
 		goto finally;
 
-	res = Py_BuildValue("OO", sock, addr);
+	res = PyTuple_Pack(2, sock, addr);
 
 finally:
 	Py_XDECREF(sock);
@@ -1911,7 +1911,7 @@
 				  addrlen)))
 		goto finally;
 
-	ret = Py_BuildValue("OO", buf, addr);
+	ret = PyTuple_Pack(2, buf, addr);
 
 finally:
 	Py_XDECREF(addr);