fix strsignal decl

[Eric Blake]

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OK to apply?  Only cygwin is impacted by this bug-fix.

2008-06-18  Eric Blake  <ebb9@byu.net>

	Per Posix, strsignal returns non-const char*.
	* libc/include/string.h (strsignal): Fix return type.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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