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and SA_NODEFER options. Spurred to action by Igor Khavkine. * sysdeps/generic/bits/sigaction.h [__USE_UNIX98 || __USE_MISC] (SA_NODEFER, SA_RESETHAND): New macros, same bit values as FreeBSD. [__USE_MISC] (SA_INTERRUPT): New macro, value 0. [__USE_MISC] (SA_NOMASK, SA_ONESHOT, SA_STACK): New macros, aliases as in other sysdeps versions of this file. * sysdeps/generic/bits/sigaction.h (struct sigaction): Use a union and provide sa_handler and sa_sigaction member names as macros, as done in other sysdeps versions of this file. Suggested by Igor Khavkine <i_khavki@alcor.concordia.ca>.