games/gemrb: update to 0.9.2
New features:
- PVR(Z), BAM2, MOS2 and TIS2 support
- support for higher AI speeds ("FPS") and VSync
- support for EE-style saves, TLK locations and many more tables
- PST's floating text and personalized pc comments
- optional smooth fog of war on SDL >= 2.0.18
- 3e-style sneak attack and crippling strike from HoW/iwdee
- Anbernic device support
Improved features:
- PST effect durations
- performance, pathfinding, formations
- combat, opcodes, EE compat, hp handling, demo
- bugfixes