On Windows, add support for Window::set_transparent #4862

Job	Run time
Check formatting	9s
Run cargo-deny on Android	28s
Run cargo-deny on iOS	29s
Run cargo-deny on Linux	26s
Test stable Windows 64bit MSVC	2m 36s
Run cargo-deny on macOS	34s
Test stable Windows 32bit MSVC	2m 57s
Run cargo-deny on Redox OS	29s
Test stable Windows 64bit GNU	3m 21s
Run cargo-deny on web	30s
Test stable Windows 32bit GNU	4m 5s
Run cargo-deny on Windows	28s
Test stable Linux 32bit	6m 7s
Test stable Linux 64bit	5m 29s
Test stable X11	4m 58s
Test stable Wayland	4m 33s
Test stable Android	1m 45s
Test stable Redox OS	29s
Test stable macOS	1m 35s
Test stable iOS x86_64	1m 50s
Test stable iOS Aarch64	2m 15s
Test stable web	1m 35s
Test nightly Windows 64bit MSVC	2m 12s
Test nightly Windows 32bit MSVC	2m 29s
Test nightly Windows 64bit GNU	3m 7s
Test nightly Windows 32bit GNU	2m 59s
Test nightly Linux 32bit	5m 24s
Test nightly Linux 64bit	5m 54s
Test nightly X11	3m 38s
Test nightly Wayland	3m 30s
Test nightly Android	1m 23s
Test nightly Redox OS	25s
Test nightly macOS	1m 22s
Test nightly iOS x86_64	1m 54s
Test nightly iOS Aarch64	1m 14s
Test nightly web	1m 12s
Test 1.65.0 Windows 64bit MSVC	1m 55s
Test 1.65.0 Windows 32bit MSVC	2m 7s
Test 1.65.0 Windows 64bit GNU	1m 32s
Test 1.65.0 Windows 32bit GNU	2m 3s
Test 1.65.0 Linux 32bit	2m 59s
Test 1.65.0 Linux 64bit	2m 34s
Test 1.65.0 X11	1m 28s
Test 1.65.0 Wayland	1m 17s
Test 1.65.0 Redox OS	49s
Test 1.65.0 macOS	1m 46s
Test 1.65.0 iOS x86_64	1m 31s
Test 1.65.0 iOS Aarch64	1m 36s
Test 1.65.0 web	1m 23s
Test 1.69.0 Android	1m 47s
	1h 48m 38s

Provide feedback