Update new test to use EXTENSIONS section instead of SKIPIF

Fix #81739: OOB read due to insufficient validation in imageloadfont()

If we swap the byte order of the relevant header bytes, we need to make
sure again that the following multiplicatio

Fix #81739: OOB read due to insufficient validation in imageloadfont()

If we swap the byte order of the relevant header bytes, we need to make
sure again that the following multiplication does not overflow.

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