On macOS, add support for `Window::set_blur` #4863

Job	Run time
Check formatting	6s
Run cargo-deny on Android	29s
Run cargo-deny on iOS	31s
Run cargo-deny on Linux	28s
Run cargo-deny on macOS	29s
Run cargo-deny on Redox OS	27s
Run cargo-deny on web	27s
Run cargo-deny on Windows	26s
Test stable Windows 64bit MSVC	3m 50s
Test stable Windows 32bit MSVC	3m 37s
Test stable Windows 64bit GNU	4m 26s
Test stable Windows 32bit GNU	3m 28s
Test stable Linux 32bit	4m 48s
Test stable Linux 64bit	6m 4s
Test stable X11	4m 40s
Test stable Wayland	4m 38s
Test stable Android	1m 41s
Test stable Redox OS	32s
Test stable macOS	1m 28s
Test stable iOS x86_64	1m 36s
Test stable iOS Aarch64	1m 21s
Test stable web	1m 45s
Test nightly Windows 64bit MSVC	2m 0s
Test nightly Windows 32bit MSVC	2m 11s
Test nightly Windows 64bit GNU	3m 8s
Test nightly Windows 32bit GNU	2m 46s
Test nightly Linux 32bit	6m 22s
Test nightly Linux 64bit	5m 52s
Test nightly X11	5m 5s
Test nightly Wayland	3m 33s
Test nightly Android	1m 31s
Test nightly Redox OS	26s
Test nightly macOS	2m 22s
Test nightly iOS x86_64	1m 9s
Test nightly iOS Aarch64	1m 32s
Test nightly web	1m 10s
Test 1.65.0 Windows 64bit MSVC	1m 35s
Test 1.65.0 Windows 32bit MSVC	1m 16s
Test 1.65.0 Windows 64bit GNU	1m 22s
Test 1.65.0 Windows 32bit GNU	2m 6s
Test 1.65.0 Linux 32bit	2m 9s
Test 1.65.0 Linux 64bit	2m 2s
Test 1.65.0 X11	1m 9s
Test 1.65.0 Wayland	1m 29s
Test 1.65.0 Redox OS	38s
Test 1.65.0 macOS	1m 17s
Test 1.65.0 iOS x86_64	1m 7s
Test 1.65.0 iOS Aarch64	1m 13s
Test 1.65.0 web	49s
Test 1.69.0 Android	2m 10s
	1h 46m 46s

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