dirac: use autoreconf instead of custom script

Fix use of ACLOCAL_AMFLAGS

extras/contrib/src/Patches/dirac-autotools.patch

+--- dirac/Makefile.am.orig	2010-11-01 01:31:21.638194470 +0100
++++ dirac/Makefile.am	2010-11-01 01:31:25.174196742 +0100
+@@ -1,6 +1,8 @@
+ # $Id: Makefile.am,v 1.22 2008/10/01 05:33:56 asuraparaju Exp $
+ #
+ 
++ACLOCAL_AMFLAGS= -I m4
++
+ SUBDIRS = libdirac_byteio libdirac_common libdirac_motionest libdirac_encoder \
+           libdirac_decoder encoder decoder $(CPPUNITTESTS_DIR) \
+           tests $(DOC_DIR) win32
+--- dirac/configure.ac.orig	2010-11-01 01:26:21.058194985 +0100
++++ dirac/configure.ac	2010-11-01 01:32:22.062185299 +0100
+@@ -57,8 +57,6 @@
+ AM_PROG_LIBTOOL
+ AC_SYS_LARGEFILE
+ 
+-ACLOCAL_AMFLAGS="-I m4 $ACLOCAL_AMFLAGS"
+-AC_SUBST(ACLOCAL_AMFLAGS)
+ 
+ 
+ dnl -------------------------------------------------------------------------

extras/contrib/src/contrib-src.mak

@@ -2045,7 +2045,8 @@ ifdef HAVE_CYGWIN
 	patch -p0 < Patches/dirac-cygwin.patch
 endif
 	patch -p0 < Patches/dirac-noutils.patch
-	(cd $@; ./bootstrap)
+	patch -p0 < Patches/dirac-autotools.patch
+	(cd $@; autoreconf -ivf)
 
 DIRAC_SUBDIRS = libdirac_byteio libdirac_common libdirac_motionest libdirac_encoder libdirac_decoder