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5c78499ae2
Use proper internal macros for BSD sig_t and GNU sighandler_t. sigaltstack and friends are XSI even in SUSv4 but in glibc are nonetheless handled as POSIX.1-2008 (not 2001). The requirement for the ucontext_t typedef in signal.h was XSI prior to POSIX.1-2008. Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>