libsForQt5.qtwebengine: backport upstream patch for gperf ≥ 3.2

Backported from: <https://github.com/chromium/chromium/commit/f8f21fb4aa01f75acbb12abf5ea8c263c6817141.patch>

Original author: Daniel Richard G <iskunk@gmail.com>

diff --git a/src/3rdparty/chromium/third_party/blink/renderer/build/scripts/gperf.py b/src/3rdparty/chromium/third_party/blink/renderer/build/scripts/gperf.py

index 5ee4905..6c500a0 100644

--- a/src/3rdparty/chromium/third_party/blink/renderer/build/scripts/gperf.py

+++ b/src/3rdparty/chromium/third_party/blink/renderer/build/scripts/gperf.py

@@ -36,10 +36,13 @@ def generate_gperf(gperf_path, gperf_input, gperf_args):

         # https://savannah.gnu.org/bugs/index.php?53028

         gperf_output = re.sub(r'\bregister ', '', gperf_output)

         # -Wimplicit-fallthrough needs an explicit fallthrough statement,

-        # so replace gperf's /*FALLTHROUGH*/ comment with the statement.

-        # https://savannah.gnu.org/bugs/index.php?53029

-        gperf_output = gperf_output.replace('/*FALLTHROUGH*/',

-                                            '  FALLTHROUGH;')

+        # so replace gperf 3.1's /*FALLTHROUGH*/ comment with the statement.

+        # https://savannah.gnu.org/bugs/index.php?53029 (fixed in 3.2)

+        if re.search(

+                r'/\* C\+\+ code produced by gperf version 3\.[01](\.\d+)? \*/',

+                gperf_output):

+            gperf_output = gperf_output.replace('/*FALLTHROUGH*/',

+                                                '  [[fallthrough]];')

         # -Wpointer-to-int-cast warns about casting pointers to smaller ints

         # Replace {(int)(long)&(foo), bar} with

         # {static_cast<int>(reinterpret_cast<uintptr_t>(&(foo)), bar}

        hash = "sha256-DcAYOV9b30ogPCiedvQimEmiZpUJquk5j6WLjJxR54U=";

        extraPrefix = "";

      })

      # Fix the build with gperf ≥ 3.2 and Clang 19.

      ./qtwebengine-gperf-3.2.patch

    ];

    postPatch = ''