ICU-22532 Remove redundant 'void' from empty C++ parameter lists #1335

Job	Run time
clang-valgrind-intltest (utility)	6m 49s
clang-valgrind-intltest (normalize)	6m 41s
clang-valgrind-intltest (collator)	5m 23s
clang-valgrind-test	10m 5s
clang-valgrind-intltest (regex)	5m 39s
clang-valgrind-intltest (format)	16m 42s
clang-valgrind-intltest (translit)	6m 10s
clang-valgrind-intltest (rbbi)	7m 44s
clang-valgrind-intltest (rbnf)	6m 31s
clang-valgrind-intltest (rbnfrt)	6m 29s
clang-valgrind-intltest (icuserv)	5m 23s
clang-valgrind-intltest (idna)	5m 30s
clang-valgrind-intltest (convert)	7m 5s
clang-valgrind-intltest (rbnfp)	5m 22s
clang-valgrind-intltest (csdet)	5m 23s
clang-valgrind-intltest (spoof)	5m 4s
clang-valgrind-intltest (bidi)	6m 2s
	1h 58m 2s

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