Fix --disable-unicode compilation problems.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 04a0611..fd7f69f 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -22,6 +22,11 @@
disguised Unix interface). Refer to the library manual and\n\
corresponding Unix manual entries for more information on calls.");
+#ifndef Py_USING_UNICODE
+/* This is used in signatures of functions. */
+#define Py_UNICODE void
+#endif
+
#if defined(PYOS_OS2)
#define INCL_DOS
#define INCL_DOSERRORS