$NetBSD: patch-aa,v 1.3 2016/08/09 13:35:28 mef Exp $

Let to exactly point to own diff program.
Fixes PR 39941.

--- src/Makefile.in.orig	2012-04-07 01:21:43.000000000 +0200
+++ src/Makefile.in	2012-04-07 01:22:34.000000000 +0200
@@ -1034,7 +1034,7 @@
 
 noinst_HEADERS = diff.h system.h
 MOSTLYCLEANFILES = paths.h paths.ht
-gdiff = `echo diff|sed '$(transform)'`
+gdiff = "%DEFAULT_DIFF_PROGRAM%"
 BUILT_SOURCES = paths.h version.c version.h
 noinst_LIBRARIES = libver.a
 nodist_libver_a_SOURCES = version.c version.h