qt6-webengine: removed unused patch

qt6-webengine/qtwebengine-6.5.3-libxml2-2.12.patch

@@ -1,39 +0,0 @@
-Patch status: fixed in >=chromium-121.0.6104.0 with caveat
-
-Fix build failure[1] with libxml2-2.12 due xmlError changes.
-
-For convenience, use LIBXML_VERSION like webkit did[2] rather than
-chromium's upstream fix[3] which relies on bundled libxml2 always
-being 2.12.x (spares having to use has_version).
-
-When fix lands in qtwebengine, will need to depend on >=libxml2-2.12
-unless Qt decides to do something different considering that cmake
-uses system libxml2 by default and it may be too early to enforce it.
-
-[1] https://bugs.gentoo.org/917601
-[2] https://github.com/WebKit/WebKit/commit/1bad176b2496579d760852c80cff3ad9fb7c3a4b
-[3] https://crrev.com/871f8ae9b65ce2679b0bc0be36902d65edf0c1e4
---- a/src/3rdparty/chromium/third_party/blink/renderer/core/xml/xslt_processor.h
-+++ b/src/3rdparty/chromium/third_party/blink/renderer/core/xml/xslt_processor.h
-@@ -78,5 +78,9 @@
-   void reset();
- 
-+#if LIBXML_VERSION >= 21200
-+  static void ParseErrorFunc(void* user_data, const xmlError*);
-+#else
-   static void ParseErrorFunc(void* user_data, xmlError*);
-+#endif
-   static void GenericErrorFunc(void* user_data, const char* msg, ...);
- 
---- a/src/3rdparty/chromium/third_party/blink/renderer/core/xml/xslt_processor_libxslt.cc
-+++ b/src/3rdparty/chromium/third_party/blink/renderer/core/xml/xslt_processor_libxslt.cc
-@@ -67,5 +67,9 @@
- }
- 
-+#if LIBXML_VERSION >= 21200
-+void XSLTProcessor::ParseErrorFunc(void* user_data, const xmlError* error) {
-+#else
- void XSLTProcessor::ParseErrorFunc(void* user_data, xmlError* error) {
-+#endif
-   FrameConsole* console = static_cast<FrameConsole*>(user_data);
-   if (!console)