ICU-22721 Cherry-pick MinGW CI bugfix to maint-75 #2206

Job	Run time
clang-valgrind-intltest (utility)	6m 49s
clang-valgrind-intltest (normalize)	6m 35s
clang-valgrind-test	10m 20s
clang-valgrind-intltest (collator)	5m 11s
clang-valgrind-intltest (regex)	5m 19s
clang-valgrind-intltest (format)	16m 47s
clang-valgrind-intltest (translit)	5m 51s
clang-valgrind-intltest (rbbi)	7m 22s
clang-valgrind-intltest (rbnf)	6m 44s
clang-valgrind-intltest (rbnfrt)	5m 40s
clang-valgrind-intltest (icuserv)	5m 35s
clang-valgrind-intltest (idna)	5m 16s
clang-valgrind-intltest (convert)	6m 25s
clang-valgrind-intltest (rbnfp)	4m 53s
clang-valgrind-intltest (csdet)	5m 15s
clang-valgrind-intltest (spoof)	4m 57s
clang-valgrind-intltest (bidi)	5m 26s
	1h 54m 25s

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