qt5-webengine: fix build on gcc12

srcpkgs/qt5-webengine/patches/qt5-webengine-gcc12.patch

@@ -0,0 +1,15 @@
+Add missing include for std::begin and std::end in SkParseColor.cpp
+
+https://skia-review.googlesource.com/c/skia/+/533981
+
+--- a/src/3rdparty/chromium/third_party/skia/src/utils/SkParseColor.cpp
++++ b/src/3rdparty/chromium/third_party/skia/src/utils/SkParseColor.cpp
+@@ -8,6 +8,8 @@
+ 
+ #include "include/utils/SkParse.h"
+ 
++#include <iterator>
++
+ static constexpr const char* gColorNames[] = {
+     "aliceblue",
+     "antiquewhite",