* fix: correct redefinition which is invalid C++

See https://stackoverflow.com/a/15538759 for an explanation of class scope.
GCC gives an error when compiling this code: https://godbolt.org/z/sYhc3cMjE



* Update export_gin_v8platform_pageallocator_for_usage_outside_of_the_gin.patch

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Co-authored-by: Cheng Zhao <zcbenz@gmail.com>
Co-authored-by: Cheng Zhao <github@zcbenz.com>