$NetBSD: patch-configure,v 1.1 2013/04/20 17:39:01 asau Exp $

Make it use weak symbols with Clang.

--- configure.orig	2013-03-28 21:03:38.000000000 +0000
+++ configure
@@ -27768,7 +27768,9 @@ else
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#ifndef __clang__
 extern int PFoo(int);
+#endif
 #pragma weak PFoo = Foo
 int Foo(int a) { return a; }