[CMake] Regenerate bindings when UnifiedWebPreferences is modified

https://bugs.webkit.org/show_bug.cgi?id=264156

Reviewed by Don Olmstead.

When a setting is removed from UnifiedWebPreferences the output of
the generated files may change if an IDL file uses EnabledBySetting.

Ideally this would be tracked per IDL file but that isn't how the
generator currently works.

* Source/WebCore/WebCoreMacros.cmake:

Canonical link: https://commits.webkit.org/276276@main

Source/WebCore/WebCoreMacros.cmake

@@ -112,6 +112,8 @@ function(GENERATE_BINDINGS target)
         # Changing enabled features should trigger recompiling all IDL files
         # because some of them use #if.
         ${CMAKE_BINARY_DIR}/cmakeconfig.h
+        # Settings can be removed also which requires regeneration.
+        ${WTF_WEB_PREFERENCES}
     )
     if (EXISTS ${WEBCORE_DIR}/bindings/scripts/CodeGenerator${arg_GENERATOR}.pm)
         list(APPEND common_generator_dependencies ${WEBCORE_DIR}/bindings/scripts/CodeGenerator${arg_GENERATOR}.pm)