Build xine-lib with wavpack support

Activate wavpack support in xine-lib. This reveals a latent bug
(missing include) in xine-lib, for which a patch is provided.

src/xine-lib-2-wavpack-alloca.patch

@@ -0,0 +1,23 @@
+This file is part of MXE.
+See index.html for further information.
+
+This patch has been taken from:
+https://bugs.xine-project.org/show_bug.cgi?id=494
+
+diff -urN xine-lib-1.1.21-orig/src/combined/decoder_wavpack.c xine-lib-1.1.21/src/combined/decoder_wavpack.c
+--- xine-lib-1.1.21-orig/src/combined/decoder_wavpack.c	2010-03-09 23:17:05.000000000 +0100
++++ xine-lib-1.1.21/src/combined/decoder_wavpack.c	2013-03-03 17:43:00.000000000 +0100
+@@ -27,6 +27,13 @@
+ #define LOG_MODULE "decode_wavpack"
+ #define LOG_VERBOSE
+ 
++#ifdef HAVE_ALLOCA_H
++#include <alloca.h>
++#endif
++#ifdef HAVE_MALLOC_H
++#include <malloc.h>
++#endif
++
+ #include "xine_internal.h"
+ #include "attributes.h"
+ #include "bswap.h"

src/xine-lib.mk

@@ -7,7 +7,7 @@ $(PKG)_CHECKSUM := 0adf20ef55d24f2a1b4a8974e57ad1be5133b236
 $(PKG)_SUBDIR   := $(PKG)-$($(PKG)_VERSION)
 $(PKG)_FILE     := $(PKG)-$($(PKG)_VERSION).tar.xz
 $(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/project/xine/$(PKG)/$($(PKG)_VERSION)/$($(PKG)_FILE)
-$(PKG)_DEPS     := gcc faad2 ffmpeg flac fontconfig freetype graphicsmagick libiconv libmng pthreads sdl speex theora vorbis zlib
+$(PKG)_DEPS     := gcc faad2 ffmpeg flac fontconfig freetype graphicsmagick libiconv libmng pthreads sdl speex theora vorbis wavpack zlib
 
 define $(PKG)_UPDATE
     $(WGET) -q -O- 'http://hg.debian.org/hg/xine-lib/xine-lib/tags' | \
@@ -51,7 +51,7 @@ define $(PKG)_BUILD
         --with-internal-vcdlibs \
         --with-external-libfaad \
         --without-external-libdts \
-        --without-wavpack \
+        --with-wavpack \
         CFLAGS='-I$(1)/win32/include' \
         PTHREAD_LIBS='-lpthread -lws2_32' \
         LIBS="`$(TARGET)-pkg-config --libs libmng`"