On macOS, add support for `Window::set_blur` #4865

Job	Run time
Check formatting	9s
Run cargo-deny on Android	29s
Run cargo-deny on iOS	28s
Run cargo-deny on Linux	33s
Test stable Windows 64bit MSVC	3m 33s
Run cargo-deny on macOS	29s
Test stable Windows 32bit MSVC	3m 3s
Run cargo-deny on Redox OS	31s
Test stable Windows 64bit GNU	3m 20s
Run cargo-deny on web	25s
Test stable Windows 32bit GNU	3m 27s
Run cargo-deny on Windows	33s
Test stable Linux 32bit	5m 1s
Test stable Linux 64bit	5m 10s
Test stable X11	4m 14s
Test stable Wayland	3m 47s
Test stable Android	1m 30s
Test stable Redox OS	29s
Test stable macOS	2m 29s
Test stable iOS x86_64	2m 13s
Test stable iOS Aarch64	2m 46s
Test stable web	1m 20s
Test nightly Windows 64bit MSVC	2m 38s
Test nightly Windows 32bit MSVC	1m 59s
Test nightly Windows 64bit GNU	3m 17s
Test nightly Windows 32bit GNU	3m 30s
Test nightly Linux 32bit	4m 53s
Test nightly Linux 64bit	4m 50s
Test nightly X11	4m 12s
Test nightly Wayland	5m 22s
Test nightly Android	1m 22s
Test nightly Redox OS	29s
Test nightly macOS	1m 58s
Test nightly iOS x86_64	3m 18s
Test nightly iOS Aarch64	1m 45s
Test nightly web	1m 23s
Test 1.65.0 Windows 64bit MSVC	1m 49s
Test 1.65.0 Windows 32bit MSVC	1m 32s
Test 1.65.0 Windows 64bit GNU	7m 39s
Test 1.65.0 Windows 32bit GNU	8m 33s
Test 1.65.0 Linux 32bit	2m 19s
Test 1.65.0 Linux 64bit	1m 53s
Test 1.65.0 X11	1m 17s
Test 1.65.0 Wayland	6m 4s
Test 1.65.0 Redox OS	5m 10s
Test 1.65.0 macOS	6m 18s
Test 1.65.0 iOS x86_64	5m 27s
Test 1.65.0 iOS Aarch64	6m 55s
Test 1.65.0 web	5m 7s
Test 1.69.0 Android	1m 33s
	2h 28m 31s

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