Fix stringification of abnormal `Process::Status` on Windows [fixup #15255] #13021

Job	Run time
check_format	1m 40s
x86_64-gnu-test-preview_mt	5m 37s
x86_64-gnu-test (1.7.3)	35m 59s
x86_64-musl-test	35m 44s
x86_64-gnu-test (1.8.2)	33m 40s
x86_64-gnu-test (1.9.2)	37m 34s
x86_64-gnu-test (1.10.1)	35m 23s
x86_64-gnu-test (1.11.2)	36m 9s
x86_64-gnu-test (1.12.2)	36m 5s
x86_64-gnu-test (1.13.3)	35m 32s
x86_64-gnu-test (1.14.0)	35m 16s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	34m 37s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	38m 33s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	37m 10s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 31s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	35m 39s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	36m 8s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 47s
	9h 40m 4s

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