fix(udp): make GRO (i.e. URO) optional on Windows, off by default #5213

Job	Run time
test on illumos	6m 35s
test on solaris	8m 28s
test on netbsd	5m 11s
audit	25s
features (ubuntu-latest)	1m 50s
lint	1m 20s
features (macos-latest)	1m 54s
msrv	58s
test (ubuntu-latest, stable)	1m 39s
features (windows-latest)	1m 32s
test (ubuntu-latest, beta)	1m 12s
test-android (x86_64-linux-android, x86_64, 26)	2m 57s
test (macos-latest, stable)	1m 31s
test-aws-lc-rs	1m 40s
test-android (i686-linux-android, x86, 26)	2m 48s
test on freebsd	4m 3s
test (windows-latest, stable)	2m 30s
test wasm32-unknown-unknown	50s
	47m 23s

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