Move the signal module back into Setup.config.in so it can be enabled
and disabled from the configure script.
diff --git a/Modules/Setup.config.in b/Modules/Setup.config.in
index b9b7a1e..7a27e52 100644
--- a/Modules/Setup.config.in
+++ b/Modules/Setup.config.in
@@ -9,5 +9,8 @@
# Threading
@USE_THREAD_MODULE@thread threadmodule.c
+# The signal module
+@USE_SIGNAL_MODULE@signal signalmodule.c
+
# The rest of the modules previously listed in this file are built
# by the setup.py script in Python 2.1.