Make dummy int public (with _Py_ prefix), to keep gcc -Wall happy.
diff --git a/Modules/sgimodule.c b/Modules/sgimodule.c
index baffc70..49087b2 100644
--- a/Modules/sgimodule.c
+++ b/Modules/sgimodule.c
@@ -92,4 +92,5 @@
 	initmodule("sgi", sgi_methods);
 }
 
-static int dummy; /* $%#@!& dl wants at least a byte of bss */
+int _Py_sgi_dummy; /* $%#@!& dl wants at least a byte of bss */
+/* And gcc -Wall doesn't like unused static variables :-( */