orcus: xml header is only mandatory in xml 1.1+

Change-Id: I28aa8a2f340cb1a100dfa5d10d8d6e9b8dac2479
Reviewed-on: https://gerrit.libreoffice.org/41080Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

external/liborcus/UnpackedTarball_liborcus.mk

@@ -19,6 +19,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,liborcus,\
 	external/liborcus/visibility.patch.0 \
 	external/liborcus/iOS.patch \
 	external/liborcus/nullptr-in-ostringstream.patch.1 \
+	external/liborcus/orcus_allow_missing_xml_header.patch.1 \
 ))
 
 ifeq ($(OS),WNT)

external/liborcus/orcus_allow_missing_xml_header.patch.1

+diff -ur liborcus.org/include/orcus/sax_parser.hpp liborcus/include/orcus/sax_parser.hpp
+--- liborcus.org/include/orcus/sax_parser.hpp	2017-08-12 09:44:21.379509116 +0200
++++ liborcus/include/orcus/sax_parser.hpp	2017-08-12 09:46:06.884259216 +0200
+@@ -20,7 +20,7 @@
+      * parsing regardless of whether or not the xml stream begins with a
+      * <?xml..?> declaration.
+      */
+-    static const bool strict_xml_declaration = true;
++    static const bool strict_xml_declaration = false;
+ };
+ 
+ /**