ICU-22556 Prefer cc and c++ compilers #1666

Job	Run time
clang-valgrind-intltest (utility)	6m 17s
clang-valgrind-intltest (normalize)	7m 1s
clang-valgrind-test	9m 42s
clang-valgrind-intltest (collator)	5m 24s
clang-valgrind-intltest (regex)	4m 39s
clang-valgrind-intltest (format)	18m 4s
clang-valgrind-intltest (translit)	5m 46s
clang-valgrind-intltest (rbbi)	7m 21s
clang-valgrind-intltest (rbnf)	5m 53s
clang-valgrind-intltest (rbnfrt)	5m 53s
clang-valgrind-intltest (icuserv)	4m 38s
clang-valgrind-intltest (idna)	5m 35s
clang-valgrind-intltest (convert)	6m 19s
clang-valgrind-intltest (rbnfp)	5m 3s
clang-valgrind-intltest (csdet)	5m 22s
clang-valgrind-intltest (spoof)	4m 55s
clang-valgrind-intltest (bidi)	4m 55s
	1h 52m 47s

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