datapath_winuser: query RioDispatch only if we are using Rio #3669

Job	Run time
Ubuntu (linux, ubuntu-20.04, x64, openssl) / Build	3m 6s
Ubuntu (linux, ubuntu-22.04, x64, openssl3) / Build	3m 5s
Ubuntu (linux, ubuntu-24.04, x64, openssl3, -UseXdp) / Build	3m 0s
Windows (windows, windows-2022, x64, openssl3) / Build	5m 22s
Windows (windows, windows-2022, x64, openssl) / Build	4m 3s
Build All Darwin Frameworks / Build Darwin Binaries (ios, arm64) / Build	3m 45s
Build All Darwin Frameworks / Build Darwin Binaries (ios, x64) / Build	3m 20s
Build All Darwin Frameworks / Build Darwin Binaries (macos, arm64) / Build	4m 41s
Build All Darwin Frameworks / Build Darwin Binaries (macos, x64) / Build	4m 1s
Build All Darwin Frameworks / Build Universal Binaries	22s
Build All Darwin Frameworks / Build Darwin Framework (ios, x64)	19s
Build All Darwin Frameworks / Build Darwin Framework (ios, arm64)	39s
Build All Darwin Frameworks / Build Darwin Framework (macos, universal)	17s
Build All Darwin Frameworks / Build Darwin XCFramework	31s
DotNet Test (windows, windows-2022, x64, openssl)	2m 10s
DotNet Test (windows, windows-2022, x64, openssl3)	2m 26s
DotNet Test (linux, ubuntu-20.04, x64, openssl)	1m 25s
DotNet Test (linux, ubuntu-22.04, x64, openssl3)	1m 9s
DotNet Test (linux, ubuntu-24.04, x64, openssl3, -UseXdp)	1m 58s
DotNet Test (macos, macos-13, universal, openssl)	50s
	46m 29s

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