Don’t skip glyph 0 in cmap.

[brendandahl]

Fixes #8234.

Hopefully this won't break anything since our support for notdef is better these days.

[brendandahl]

/botio test

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_test from @brendandahl received. Current queue size: 0

Live output at: http://107.21.233.14:8877/a9d0645ad5bc9c6/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_test from @brendandahl received. Current queue size: 0

Live output at: http://54.215.176.217:8877/234cfd503c5917c/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://54.215.176.217:8877/234cfd503c5917c/output.txt

Total script time: 23.64 mins

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

[pdfjsbot]

From: Bot.io (Linux)

---

Success

Full output at http://107.21.233.14:8877/a9d0645ad5bc9c6/output.txt

Total script time: 30.26 mins

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

[Snuffleupagus]

This was a lot simpler than I imagined :-)
Thank you for the patch!

[Snuffleupagus]

/botio makeref

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_makeref from @Snuffleupagus received. Current queue size: 0

Live output at: http://107.21.233.14:8877/77e57ed06bdcd7e/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_makeref from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.215.176.217:8877/c22561d3f084ee2/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://54.215.176.217:8877/c22561d3f084ee2/output.txt

Total script time: 23.06 mins

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

[pdfjsbot]

From: Bot.io (Linux)

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Success

Full output at http://107.21.233.14:8877/77e57ed06bdcd7e/output.txt

Total script time: 28.82 mins

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