fix(udp): make GRO (i.e. URO) optional on Windows, off by default #5215

Job	Run time
test on freebsd	6m 15s
test on solaris	10m 46s
test on netbsd	5m 16s
audit	22s
features (ubuntu-latest)	1h 23m 42s
lint	1m 9s
features (macos-latest)	27m 52s
msrv	1m 7s
features (windows-latest)	52m 29s
test (ubuntu-latest, stable)	1m 51s
test (ubuntu-latest, beta)	1m 20s
test-android (x86_64-linux-android, x86_64, 26)	3m 1s
test-aws-lc-rs	1m 47s
test (macos-latest, stable)	1m 15s
test on illumos	6m 31s
test-android (i686-linux-android, x86, 26)	3m 5s
test (windows-latest, stable)	3m 57s
test wasm32-unknown-unknown	48s
	3h 32m 33s

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