libxml2: upgrade to release 2.9.9

* fixes CVE-2018-14404
* drop one hunk from libxml2-android.patch that was added in commit
  6a17d2f2; presumably nan() exists now
  given that other code is calling it.

Change-Id: I696cc4e1da55536ea1c89a6e0446ce5bc8398ba4
Reviewed-on: https://gerrit.libreoffice.org/66308
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

download.lst

@@ -156,8 +156,8 @@ export LIBTOMMATH_SHA256SUM := 083daa92d8ee6f4af96a6143b12d7fc8fe1a547e14f862304
 export LIBTOMMATH_TARBALL := ltm-1.0.zip
 export XMLSEC_SHA256SUM := 97d756bad8e92588e6997d2227797eaa900d05e34a426829b149f65d87118eb6
 export XMLSEC_TARBALL := xmlsec1-1.2.27.tar.gz
-export LIBXML_SHA256SUM := 0b74e51595654f958148759cfef0993114ddccccbb6f31aee018f3558e8e2732
-export LIBXML_VERSION_MICRO := 8
+export LIBXML_SHA256SUM := 94fb70890143e3c6549f265cee93ec064c80a84c42ad0f23e85ee1fd6540a871
+export LIBXML_VERSION_MICRO := 9
 export LIBXML_TARBALL := libxml2-2.9.$(LIBXML_VERSION_MICRO).tar.gz
 export LIBXSLT_SHA256SUM := 526ecd0abaf4a7789041622c3950c0e7f2c4c8835471515fd77eec684a355460
 export LIBXSLT_VERSION_MICRO := 32

external/libxml2/libxml2-android.patch

---- misc/libxml2-2.7.6/trionan.c
-+++ misc/build/libxml2-2.7.6/trionan.c
-@@ -327,7 +327,7 @@
- 
-   if (result == 0.0) {
- 
--#if defined(TRIO_COMPILER_SUPPORTS_C99)
-+#if defined(TRIO_COMPILER_SUPPORTS_C99) && !(defined(__ANDROID__) && defined(__clang__))
-     result = nan("");
- 
- #elif defined(NAN) && defined(__STDC_IEC_559__)
-
 --- misc/libxml2-2.7.6/Makefile.in
 +++ misc/build/libxml2-2.7.6/Makefile.in
 @@ -1635,7 +1635,7 @@

external/libxml2/libxml2-global-symbols.patch

@@ -14,8 +14,8 @@
  
  LIBXML2_2.6.32 {
 @@ -2231,3 +2231,43 @@
-   xmlXPathSetContextNode;
- } LIBXML2_2.9.0;
+   xmlHashDefaultDeallocator;
+ } LIBXML2_2.9.1;
  
 +# HACK: export global variable accessor functions (globals.h)
 +LIBXML2_GLOBAL_VARIABLES {