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shel scripts no longer export BIN_SH, due to configuration hassles with this. * lib/m4sugar/m4sh.m4 (AS_BOURNE_COMPATIBLE): Don't set BIN_SH or DUALCASE. (_AS_DETECT_BETTER_SHELL): Don't look in /usr/bin/posix. Use AS_EXECUTABLE_P rather than test -f. (AS_SHELL_SANITIZE): Set DUALCASE. (AS_EXECUTABLE_P): Just invoke as_executable_p. (_AS_TEST_PREPARE): Default to test -f, rather than to nothing.