Add sigaltstack() to RTEMS conditional path

[Joel Sherrill]

Hi

This patch adds sigaltstack() prototypes and structures to
the shared sys/signal.h for the RTEMS conditional part
of the file

2012-09-05  Joel Sherrill <joel.sherrill@oarcorp.com>

     * libc/include/sys/signal.h: Add sigaltstack() support for RTEMS.

-- 
Joel Sherrill, Ph.D.             Director of Research&   Development
joel.sherrill@OARcorp.com        On-Line Applications Research
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