strsignal prototype disabled on all but Cygwin

[Joel Sherrill]

Hi,

The strsignal() prototype is not defined unless you
are on Cygwin.  Since this is provided by newlib,
I think the ifdef is wrong.  The attached ifdef enables
it for RTEMS.

But I suspect it should be enabled for more.

2011-01-07  Joel Sherrill <joel.sherrill@oarcorp.com>

     * libc/include/string.h: Make strsignal() available
     on RTEMS

-- 
Joel Sherrill, Ph.D.             Director of Research&  Development
joel.sherrill@OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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