Only enable IOCP notifications in `Process#wait`, not `.new` #12352

Job	Run time
check_format	1m 40s
deploy_api_docs	0s
x86_64-gnu-test-preview_mt	5m 37s
x86_64-gnu-test (1.7.3)	35m 11s
x86_64-musl-test	36m 23s
x86_64-gnu-test (1.8.2)	35m 28s
x86_64-gnu-test (1.9.2)	35m 27s
x86_64-gnu-test (1.10.1)	33m 27s
x86_64-gnu-test (1.11.2)	33m 58s
x86_64-gnu-test (1.12.2)	34m 18s
x86_64-gnu-test (1.13.2)	35m 10s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	34m 45s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 50s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 14s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	36m 9s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	36m 20s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	34m 42s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	35m 27s
	8h 54m 6s

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