oslayer: Make wmctrl optional (for Wayland). #1178

Job	Run time
Analyze	18s
Test (Linux)	43s
Test (Code Quality)	41s
Test (Packaging)	1m 31s
Test (Qt GUI)	1m 11s
Test (Python 3.11)	-1s
Test (macOS)	-1s
Test (Python Latest Supported)	-1s
Test (Windows)	-1s
Test (Python 3.10)	-1s
Test (Python 3.12)	-1s
Build (macOS App)	-1s
Build (Windows)	-1s
Notarize (macOS App)	0s
Notarize (macOS DMG)	0s
Build (macOS DMG)	0s
Build (Linux)	4m 35s
Release	0s
	8m 51s

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