Update eSpeak to 97414c47

[seanbudd]

Link to issue number:

Closes #13945

Summary of the issue:

Janitorial update of eSpeak

Description of user facing changes

eSpeak is updated

Description of development approach

Followed instructions in include/espeak.md.
No changes to include/espeak/Makefile.am require changes to nvdaHelper\espeak\sconscript

Testing strategy:

None

Known issues with pull request:

None

Change log entries:

Changes
- eSpeak NG has been updated to 1.52-dev commit ``97414c47``. (#14060)

Code Review Checklist:

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

[AppVeyorBot]

• PASS: Translation comments check.
• PASS: Unit tests.
• PASS: Lint check.
• FAIL: System tests. See test results for more information.
• Build (for testing PR): https://ci.appveyor.com/api/buildjobs/vnfq36m0a3x3k94k/artifacts/output/nvda_snapshot_pr14060-26301,95804f4a.exe

See test results for failed build of commit 95804f4a5c