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

Install header files in backwards compatible way.

--- include/Makefile.in.orig	2014-11-12 11:59:58.000000000 +0000
+++ include/Makefile.in
@@ -314,7 +314,7 @@ top_srcdir = @top_srcdir@
 AUTOMAKE_OPTIONS = foreign
 DISTCLEANFILES = ffitarget.h
 EXTRA_DIST = ffi.h.in ffi_common.h
-includesdir = $(libdir)/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
+includesdir = $(includedir)
 nodist_includes_HEADERS = ffi.h ffitarget.h
 all: all-am