Fix header_guards.py
so it detects the copyright header properly.
#94652
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Having hardcoded offsets is a problem if the copyright header ever changes or when running on forks with different copyright header formats. This looks for the Godot header and determines the offset based on it, or if there's no header, at the start of the file. The obj-c detection had to be tweaked, as there are dummy files that only have commented out code.
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