[Bug 261949] www/qt5-webengine: Fix build with clang 14

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261949

            Bug ID: 261949
           Summary: www/qt5-webengine: Fix build with clang 14
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: kde at FreeBSD.org
             Flags: maintainer-feedback?(kde at FreeBSD.org)

During an exp-run for llvm 14 (see bug 261742), it turned out that
www/qt5-webengine fails to build with clang 14:

In file included from
gen/third_party/blink/renderer/platform/platform_jumbo_63.cc:8:
./../../../../qtwebengine-everywhere-src-5.15.2/src/3rdparty/chromium/third_party/blink/renderer/platform/text/text_break_iterator_icu.cc:122:15:
error: anonymous non-C-compatible type given name for linkage purposes by
typedef declaration after its linkage was computed; add a tag name here to
establish linkage prior to definition
typedef struct {
              ^
               UTextWithBuffer
./../../../../qtwebengine-everywhere-src-5.15.2/src/3rdparty/chromium/third_party/blink/renderer/platform/text/text_break_iterator_icu.cc:123:3:
note: type is not C-compatible due to this member declaration
  DISALLOW_NEW();
  ^~~~~~~~~~~~~~
../../../../qtwebengine-everywhere-src-5.15.2/src/3rdparty/chromium/third_party/blink/renderer/platform/wtf/allocator/allocator.h:40:2:
note: expanded from macro 'DISALLOW_NEW'
 public:                                                                      \
 ^~~~~~~
./../../../../qtwebengine-everywhere-src-5.15.2/src/3rdparty/chromium/third_party/blink/renderer/platform/text/text_break_iterator_icu.cc:126:3:
note: type is given name 'UTextWithBuffer' for linkage purposes by this typedef
declaration
} UTextWithBuffer;
  ^

This is because the typedef isn't compatible with C++ as written. Instead of:

typedef struct { ... } UTextWithBuffer;

it should just be:

struct UTextWithBuffer { ... };

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