$NetBSD: patch-ad,v 1.3 2016/01/25 17:56:39 jperkin Exp $

Install header files in backwards compatible way.

--- libffi.pc.in.orig	2014-11-08 12:47:24.000000000 +0000
+++ libffi.pc.in
@@ -2,7 +2,7 @@ prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
 toolexeclibdir=@toolexeclibdir@
-includedir=${libdir}/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
+includedir=@includedir@
 
 Name: @PACKAGE_NAME@
 Description: Library supporting Foreign Function Interfaces