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* config.guess (set_cc_for_build): Try the c17 compiler, standardized in POSIX.1-2024. See: https://pubs.opengroup.org/onlinepubs/9799919799/utilities/c17.html While we're at it, prefer c99 to c89. Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>