fix(udp): make GRO (i.e. URO) optional on Windows, off by default #5214

Job	Run time
test on freebsd	3m 56s
test on solaris	6m 1s
audit	22s
features (ubuntu-latest)	1h 26m 12s
lint	1m 5s
features (macos-latest)	24m 35s
msrv	1m 2s
features (windows-latest)	53m 0s
test (ubuntu-latest, stable)	1m 45s
test (ubuntu-latest, beta)	1m 14s
test-android (x86_64-linux-android, x86_64, 26)	2m 59s
test-aws-lc-rs	2m 12s
test-android (i686-linux-android, x86, 26)	3m 9s
test (macos-latest, stable)	1m 44s
test on illumos	6m 57s
test (windows-latest, stable)	4m 15s
test on netbsd	4m 55s
test wasm32-unknown-unknown	50s
	3h 26m 13s

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