Update to liblouis 3.32

[LeonarddeR]

Link to issue number:

None

Summary of the issue:

Update to liblouis 3.32

Description of user facing changes

None

Description of development approach

1. Update submodule
2. In this version, a dependency on Gnulib was introduced that doesn't build on Windows. See NMAKE on Windows is broken liblouis/liblouis#1689 . I fixed this using the approach from Use _strnicmp on windows liblouis/liblouis#1686. In short, rather than posix strncasecmp, we use _strnicmp .

Testing strategy:

Unit tests, running from source

Known issues with pull request:

Based on the second point as noted below development approach, an alternative could be just removing the metadata part from our liblouis build, which can be used by simply commenting out 'metadata.c' from sconscript.

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

@coderabbitai summary

[AppVeyorBot]

• Build (for testing PR): https://ci.appveyor.com/api/buildjobs/wafuwimrn7tw0ikq/artifacts/output/
• CI timing (mins):
  INIT 0.0,
  INSTALL_START 1.5,
  INSTALL_END 1.0,
  BUILD_START 0.0,
  FINISH_END 8.7

See test results for failed build of commit f1063b994c

[AppVeyorBot]

• Build (for testing PR): https://ci.appveyor.com/api/buildjobs/mijmk12r389pn181/artifacts/output/
• CI timing (mins):
  INIT 0.0,
  INSTALL_START 1.6,
  INSTALL_END 1.1,
  BUILD_START 0.0,
  FINISH_END 9.6

See test results for failed build of commit 94668c8cc4

[seanbudd]

Thanks @LeonarddeR