servo: Merge #9339 - Upgrade servo-glutin to latest published version…

… (0.4.7) (from frewsxcv:bump-glutin); r=SimonSapin

servo/glutinservo-v0.4.5...servo-v0.4.7

The primary reason I'm updating servo-glutin is to indirectly pick up
these changes:

Smithay/wayland-kbd#9

AltF02/x11-rs#32

...which results in two fewer libc 0.1.x dependency

servo#8608

Source-Repo: https://github.com/servo/servo
Source-Revision: 6b81a72228b54f37028e9400808768bd0d52d69f

UltraBlame original commit: 7b841a5bd541d3513329284db9aa2c70b1bb7972