Fix autotools warnings from libsamplerate.

(Older) autoreconf versions will fail if the autotools warnings are not
addressed.

lib-src/libsamplerate/autotools.patch

@@ -0,0 +1,74 @@
+Index: configure.ac
+===================================================================
+--- configure.ac	(revision 12937)
++++ configure.ac	(working copy)
+@@ -1,28 +1,24 @@
+ # Copyright (C) 2002-2008 Erik de Castro Lopo (erikd AT mega-nerd DOT com).
+ 
+ dnl Require autoconf version >= 2.57)
+-AC_PREREQ(2.57)
++AC_PREREQ([2.57])
+ 
+ AC_INIT([libsamplerate],[0.1.7],[erikd@mega-nerd.com])
+ 
+ # Put config stuff in Cfg.
+-AC_CONFIG_AUX_DIR(Cfg)
++AC_CONFIG_AUX_DIR([Cfg])
+ 
+ AC_CONFIG_SRCDIR([src/samplerate.c])
+ AC_CANONICAL_TARGET([])
+ 
+ AC_CONFIG_MACRO_DIR([M4])
+ 
+-AM_INIT_AUTOMAKE($PACKAGE_NAME,$PACKAGE_VERSION)
++AM_INIT_AUTOMAKE
+ dnl Audacity policy: don't enable automatic rebuild of configure et al if 
+ dnl sources change
+ AM_MAINTAINER_MODE([disable])
+ AC_CONFIG_HEADER(src/config.h)
+ 
+-
+-dnl Add parameters for aclocal
+-AC_SUBST(ACLOCAL_AMFLAGS, "-I M4")
+-
+ AC_LANG([C])
+ 
+ #------------------------------------------------------------------------------------
+Index: Makefile.am
+===================================================================
+--- Makefile.am	(revision 12937)
++++ Makefile.am	(working copy)
+@@ -1,5 +1,7 @@
+ ## Process this file with automake to produce Makefile.in
+ 
++ACLOCAL_AMFLAGS = -I M4
++
+ DISTCHECK_CONFIGURE_FLAGS = --enable-gcc-werror
+ 
+ SUBDIRS = src doc examples tests
+Index: examples/Makefile.am
+===================================================================
+--- examples/Makefile.am	(revision 12937)
++++ examples/Makefile.am	(working copy)
+@@ -6,7 +6,7 @@
+ noinst_PROGRAMS = varispeed-play timewarp-file
+ 
+ SAMPLERATEDIR =../src
+-INCLUDES = -I$(srcdir)/$(SAMPLERATEDIR) @OS_SPECIFIC_INCLUDES@
++AM_CPPFLAGS = -I$(srcdir)/$(SAMPLERATEDIR) @OS_SPECIFIC_INCLUDES@
+ 
+ OS_SPECIFIC_LINKS = @OS_SPECIFIC_LINKS@
+ 
+Index: tests/Makefile.am
+===================================================================
+--- tests/Makefile.am	(revision 12937)
++++ tests/Makefile.am	(working copy)
+@@ -5,7 +5,7 @@
+ 					downsample_test
+ 
+ SAMPLRATEDIR =../src
+-INCLUDES = -I$(srcdir)/$(SAMPLRATEDIR)
++AM_CPPFLAGS = -I$(srcdir)/$(SAMPLRATEDIR)
+ noinst_HEADERS = util.h
+ 
+ #===============================================================================