$NetBSD$

Fix 64-bit build.

--- runtime/config.h~	1995-10-03 09:55:32.000000000 -0400
+++ runtime/config.h	2008-09-04 21:04:48.000000000 -0400
@@ -12,6 +12,8 @@
 
 /* Library dependencies */
 
+#include <string.h>
+
 #ifdef HAS_MEMMOVE
 #define bcopy(src,dst,len) memmove((dst), (src), (len))
 #else
