James Zern e4f7a9f0c7 img2webp: add a warning for unused options
This may help prevent confusion when placing frame options after the
target frame.

Note for compatibility this isn't fatal, but the behavior may change in
the future.

Bug: webp:381372617
Change-Id: I9f3b51e60ff650ccc6fd29b8f5f607c3771a8a55
2024-12-10 17:32:54 -08:00
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