Log Message:
luakit: Update to 2.2.1

### Changed
- Removed debug symbol generation for default make.
- Changed the C standard from gnu99 to c11 because Webkit wants it.

### Fixed

- Fixed bounding box not spanning over whole element.
- Fixed an issue where styled hint labels caused intransparent bounding boxes.
- Fixed a race condition when a tab is closed on NetBSD.