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flagset: Fail parsing on overflowing hex strings

Nicolas Dufresne requested to merge ndufresne/gstreamer:flagset-fail-overflow into main

This adds code to detect when the hex form of the string we are to parse exceeds the number of bytes that would form a 32bit flag. This will avoid treating as flagset anything above then the expected 32bit and also stop treading DRM format with modifiers as flagset (like drm-format=AB24:0x0100000000000002).

cc @slomo @thaytan @vjaquez @He_Junyan

Edited by Nicolas Dufresne

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