libpng: add autoreconf support

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/graphics/libpng/meta

@@ -12,3 +12,5 @@ PKG_SECTION="graphics"
 PKG_SHORTDESC="libpng: Portable Network Graphics (PNG) Reference Library"
 PKG_LONGDESC="PNG (Portable Network Graphics) is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits."
 PKG_IS_ADDON="no"
+
+PKG_AUTORECONF="yes"

packages/graphics/libpng/patches/libpng-1.4.4-autoconf.patch

@@ -0,0 +1,25 @@
+diff -Naur libpng-1.4.4-old/configure.ac libpng-1.4.4-new/configure.ac
+--- libpng-1.4.4-old/configure.ac	2010-09-23 05:18:36.000000000 -0700
++++ libpng-1.4.4-new/configure.ac	2010-09-23 12:20:45.000000000 -0700
+@@ -18,16 +18,16 @@
+ 
+ dnl Version number stuff here:
+ 
+-PNGLIB_VERSION=1.4.4
+-PNGLIB_MAJOR=1
+-PNGLIB_MINOR=4
+-PNGLIB_RELEASE=4
+-
+ AC_INIT([libpng], [1.4.4], [png-mng-implement@lists.sourceforge.net])
+ AM_INIT_AUTOMAKE
+ dnl stop configure from automagically running automake
+ AM_MAINTAINER_MODE
+ 
++PNGLIB_VERSION=1.4.4
++PNGLIB_MAJOR=1
++PNGLIB_MINOR=4
++PNGLIB_RELEASE=4
++
+ dnl End of version number stuff
+ 
+ AC_CONFIG_SRCDIR([pngget.c])