Taught the Windows build about _randommodule.c.  This is compiled
into the core DLL, since it's not much code and lots of stuff uses
it (e.g., try getting a tempfile name without it).
diff --git a/PC/config.c b/PC/config.c
index 64eb962..af023bf 100644
--- a/PC/config.c
+++ b/PC/config.c
@@ -43,6 +43,7 @@
 extern void init_weakref(void);
 extern void init_hotshot(void);
 extern void initxxsubtype(void);
+extern void init_random(void);
 
 /* XXX tim: what's the purpose of ADDMODULE MARKER? */
 /* -- ADDMODULE MARKER 1 -- */
@@ -94,6 +95,7 @@
 	{"xreadlines", initxreadlines},
 	{"_weakref", init_weakref},
 	{"_hotshot", init_hotshot},
+	{"_random", init_random},
 
 	{"xxsubtype", initxxsubtype},