Log Message:
gemrb: update to 0.8.8

GemRB v0.8.8 (2021-06-02):
  New features:
    - gameplay content for the demo
    - Heart of Fury support
    - SDLAudio caching and volume control
    - PlayStation Vita port
    - simpler invocation, AppImage packages

  Improved features:
    - lightning bolts, iwd2 stealth, iwd effects, pst levelup
    - scripting, audio backends, logging
    - build system, portability and performance improvements
    - externalized summoning limit, trap limit, narration text speed
    - bugfixes