On Windows, add support for Window::set_transparent #4859

Job	Run time
Check formatting	6s
Run cargo-deny on Android	39s
Run cargo-deny on iOS	33s
Run cargo-deny on Linux	31s
Test stable Windows 64bit MSVC	2m 28s
Run cargo-deny on macOS	32s
Test stable Windows 32bit MSVC	3m 22s
Run cargo-deny on Redox OS	31s
Test stable Windows 64bit GNU	4m 12s
Run cargo-deny on web	25s
Test stable Windows 32bit GNU	3m 3s
Run cargo-deny on Windows	29s
Test stable Linux 32bit	5m 45s
Test stable Linux 64bit	5m 26s
Test stable X11	5m 31s
Test stable Wayland	3m 35s
Test stable Android	2m 5s
Test stable Redox OS	30s
Test stable macOS	1m 32s
Test stable iOS x86_64	2m 20s
Test stable iOS Aarch64	2m 8s
Test stable web	1m 31s
Test nightly Windows 64bit MSVC	2m 17s
Test nightly Windows 32bit MSVC	2m 29s
Test nightly Windows 64bit GNU	3m 48s
Test nightly Windows 32bit GNU	3m 26s
Test nightly Linux 32bit	5m 29s
Test nightly Linux 64bit	4m 44s
Test nightly X11	4m 4s
Test nightly Wayland	4m 55s
Test nightly Android	1m 24s
Test nightly Redox OS	27s
Test nightly macOS	1m 34s
Test nightly iOS x86_64	2m 37s
Test nightly iOS Aarch64	1m 18s
Test nightly web	1m 31s
Test 1.65.0 Windows 64bit MSVC	1m 24s
Test 1.65.0 Windows 32bit MSVC	1m 56s
Test 1.65.0 Windows 64bit GNU	2m 26s
Test 1.65.0 Windows 32bit GNU	2m 0s
Test 1.65.0 Linux 32bit	2m 38s
Test 1.65.0 Linux 64bit	2m 28s
Test 1.65.0 X11	2m 0s
Test 1.65.0 Wayland	1m 42s
Test 1.65.0 Redox OS	48s
Test 1.65.0 macOS	1m 41s
Test 1.65.0 iOS x86_64	1m 15s
Test 1.65.0 iOS Aarch64	1m 21s
Test 1.65.0 web	1m 25s
Test 1.69.0 Android	1m 30s
	1h 51m 51s

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