Repair CFF fonts if stem hints are in wrong order

[janpe2]

Fixes #10014
Fixes #10084

The embedded CFF fonts fail to follow CFF Type2 specification, page 11:

Hints: zero or more of each of the following hint operators, in exactly the following order: hstem, hstemhm, vstem, vstemhm, cntrmask, hintmask.

In the issues, the operators are in wrong order: first vstem and then hstem. When this happens, my patch overwrites operators hstem and hstemhm with codes vstem or vstemhm. The arguments remain in the byte array. (This is somewhat similar to the handling of dotsection in cff_parser.js.) The resulting new vertical stem hints are pointless, of course. However, all I can see is that the glyphs become only slightly blurrier because they are rendered without hstem hints. The text is still easy to read.

[brendandahl]

/botio test

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[pdfjsbot]

From: Bot.io (Linux m4)

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Full output at http://54.67.70.0:8877/2eb0399181f2b42/output.txt

Total script time: 17.79 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[pdfjsbot]

From: Bot.io (Windows)

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Full output at http://54.215.176.217:8877/39fb5de04351c3f/output.txt

Total script time: 23.37 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[brendandahl]

/botio makeref

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From: Bot.io (Linux m4)

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Success

Full output at http://54.67.70.0:8877/715db6aca425d81/output.txt

Total script time: 16.28 mins

• Lint: Passed
• Make references: Passed
• Check references: Passed

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://54.215.176.217:8877/6d02149a5257d9c/output.txt

Total script time: 21.37 mins

• Lint: Passed
• Make references: Passed
• Check references: Passed