sig_t typedef

[Yaakov (Cygwin/X)]

BSD uses the name sig_t for the return type of signal()[1], and glibc
provides this typedef alongside its own sighandler_t[2].  Patch
attached.


Yaakov

[1] http://fuse4bsd.creo.hu/localcgi/man-cgi.cgi?signal+3
[2] http://www.kernel.org/doc/man-pages/online/pages/man2/signal.2.html

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