On Windows, fix deadlock during `Cursor{Enter,Leave}` #83

Job	Run time
Check formatting	11s
Run cargo-deny on Android	28s
Run cargo-deny on iOS	28s
Run cargo-deny on Linux	30s
Test stable Windows 64bit MSVC	3m 6s
Run cargo-deny on macOS	29s
Test stable Windows 32bit MSVC	3m 47s
Run cargo-deny on Redox OS	30s
Test stable Windows 64bit GNU	4m 26s
Run cargo-deny on web	32s
Test stable Windows 32bit GNU	3m 51s
Run cargo-deny on Windows	27s
Test stable Linux 32bit	4m 38s
Test stable Linux 64bit	4m 53s
Test stable X11	5m 6s
Test stable Wayland	4m 14s
Test stable Android	1m 25s
Test stable Redox OS	23s
Test stable macOS	2m 39s
Test stable iOS x86_64	2m 4s
Test stable iOS Aarch64	2m 13s
Test stable web	1m 13s
Test nightly Windows 64bit MSVC	2m 37s
Test nightly Windows 32bit MSVC	2m 18s
Test nightly Windows 64bit GNU	3m 3s
Test nightly Windows 32bit GNU	3m 40s
Test nightly Linux 32bit	2m 5s
Test nightly Linux 64bit	1m 44s
Test nightly X11	51s
Test nightly Wayland	1m 23s
Test nightly Android	3m 5s
Test nightly Redox OS	28s
Test nightly macOS	2m 23s
Test nightly iOS x86_64	1m 26s
Test nightly iOS Aarch64	1m 16s
Test nightly web	1m 21s
Test 1.65.0 Windows 64bit MSVC	7m 20s
Test 1.65.0 Windows 32bit MSVC	7m 28s
Test 1.65.0 Windows 64bit GNU	7m 27s
Test 1.65.0 Windows 32bit GNU	8m 31s
Test 1.65.0 Linux 32bit	6m 17s
Test 1.65.0 Linux 64bit	5m 53s
Test 1.65.0 X11	5m 25s
Test 1.65.0 Wayland	5m 15s
Test 1.65.0 Redox OS	5m 33s
Test 1.65.0 macOS	5m 40s
Test 1.65.0 iOS x86_64	5m 22s
Test 1.65.0 iOS Aarch64	5m 32s
Test 1.65.0 web	4m 54s
Test 1.69.0 Android	2m 36s
	2h 38m 26s

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