[PATCH] error.h

[Yaakov (Cygwin/X)]

This patch series adds error.h and the error(3) functions, a GNU
extension:

http://www.kernel.org/doc/man-pages/online/pages/man3/error.3.html

I implemented this within Cygwin itself instead of newlib, because it is
a GNU extension which depends on program_invocation_name, another GNU
extension available only in Cygwin.

Patches for winsup/cygwin and winsup/doc, the new error.h header, and a
test application, attached.


Yaakov

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