security/putty: update to 0.78 release

FreeBSD relevant changes since 20221023 snapshot:

• f9a8213d 2022-10-29 | Docs: add a 'pdf' cmake target. (origin/main, origin/HEAD) [Jacob Nevins]
• 4ff82ab2 2022-10-28 | Update version number for 0.78 release. (tag: 0.78) [Simon Tatham]
• 475c2387 2022-10-28 | Unix: stop accessing ctrl->fileselect for font selectors. [Simon Tatham]
• 329a4cdd 2022-10-24 | authplugin-example.py: Flush stderr. [Jacob Nevins]
• 538c8fd2 2022-10-24 | authplugin-example.py: Mention documentation. [Jacob Nevins]
• a7106d8e 2022-10-23 | Add missing initialisation of term->osc_strlen. [Simon Tatham]
• bdb3ac9f 2022-10-23 | Restrict -pwfile / -pw to apply to server prompts only. [Simon Tatham]
• 2fbb9284 2022-10-23 | Fix outdated comment relating to -pw. [Jacob Nevins]
• f7e86ca2 2022-10-22 | README: remove mention of doc/Makefile. [Jacob Nevins]
• f229aab2 2022-10-23 | Rewrap a paragraph in README. [Jacob Nevins]

MFH: 2022Q4 (after 10 days)

According to Simon, he caught this assertion error in the act,
and 475c2387 should fix
PR: 267253