ICU-22952 Make configure --help show --enable-* / --disable-* consistently #3028

Job	Run time
clang-valgrind-test	10m 3s
clang-valgrind-intltest (utility)	6m 45s
clang-valgrind-intltest (normalize)	6m 24s
clang-valgrind-intltest (collator)	5m 23s
clang-valgrind-intltest (regex)	5m 16s
clang-valgrind-intltest (format)	15m 52s
clang-valgrind-intltest (translit)	5m 56s
clang-valgrind-intltest (rbbi)	7m 52s
clang-valgrind-intltest (rbnf)	6m 31s
clang-valgrind-intltest (rbnfrt)	6m 15s
clang-valgrind-intltest (icuserv)	5m 24s
clang-valgrind-intltest (idna)	5m 17s
clang-valgrind-intltest (convert)	6m 44s
clang-valgrind-intltest (rbnfp)	5m 2s
clang-valgrind-intltest (csdet)	5m 13s
clang-valgrind-intltest (spoof)	5m 5s
clang-valgrind-intltest (bidi)	5m 29s
	1h 54m 31s

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