libxml2: upgrade to 2.9.3

Beside some improvements, this also fixes several CVEs, for full
list see upstream changelog at:
https://mail.gnome.org/archives/xml/2015-November/msg00012.html

The patch needed for musl was accepted upstream, so we can remove it.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

libs/libxml2/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2014 OpenWrt.org
+# Copyright (C) 2006-2015 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libxml2
-PKG_VERSION:=2.9.2
-PKG_RELEASE:=3
+PKG_VERSION:=2.9.3
+PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://gd.tuwien.ac.at/languages/libxml/ \
 	http://xmlsoft.org/sources/ \
 	ftp://fr.rpmfind.net/pub/libxml/
-PKG_MD5SUM:=9e6a9aca9d155737868b3dc5fd82f788
+PKG_MD5SUM:=daece17e045f1c107610e137ab50c179
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING

libs/libxml2/patches/0001-threads-use-forward-declarations-only-for-glibc-fixe.patch

@@ -1,42 +0,0 @@
-From e3e04d254fb6bac49a285775b729e28b0500476c Mon Sep 17 00:00:00 2001
-From: Michael Heimpold <mhei@heimpold.de>
-Date: Sun, 21 Dec 2014 01:03:49 +0100
-Subject: [PATCH] threads: use forward declarations only for glibc (fixes
- #704908)
-
-The declarations of pthread functions, used to generate weak references
-to them, fail to suppress macros. Thus, if any pthread function has
-been provided as a macro, compiling threads.c will fail.
-This breaks on musl libc, which defines pthread_equal as a macro (in
-addition to providing the function, as required).
-
-Prevent the declarations for e.g. musl libc by refining the condition.
-
-The idea for this solution was borrowed from the alpine linux guys, see
-http://git.alpinelinux.org/cgit/aports/tree/main/libxml2/libxml2-pthread.patch
-
-Signed-off-by: Michael Heimpold <mhei@heimpold.de>
----
- threads.c |    4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
---- a/threads.c
-+++ b/threads.c
-@@ -47,7 +47,7 @@
- #ifdef HAVE_PTHREAD_H
- 
- static int libxml_is_threaded = -1;
--#ifdef __GNUC__
-+#if defined(__GNUC__) && defined(__GLIBC__)
- #ifdef linux
- #if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || (__GNUC__ > 3)
- extern int pthread_once (pthread_once_t *__once_control,
-@@ -89,7 +89,7 @@ extern int pthread_cond_signal ()
- 	   __attribute((weak));
- #endif
- #endif /* linux */
--#endif /* __GNUC__ */
-+#endif /* defined(__GNUC__) && defined(__GLIBC__) */
- #endif /* HAVE_PTHREAD_H */
- 
- /*