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When run as /bin/sh, Bash sets the shell variable POSIXLY_CORRECT to y. The test suite checks for the envvar POSIXLY_CORRECT to turn of some tests not supported in POSIX mode. Restore these tests. Reported by the Hydra build farm, from Rob Vermaas. * tests/local.at (AT_BISON_CHECK_WARNINGS_): Check the envvar POSIXLY_CORRECT, not the shell variable.