isatty: Make it return true in Cygwin consoles on native Windows. * lib/isatty.c: Include <string.h>. (GetProcAddress): New macro. (GetNamedPipeClientProcessIdFuncType): New type. (GetNamedPipeClientProcessIdFunc): New variable. (QueryFullProcessImageNameFuncType): New type. (QueryFullProcessImageNameFunc): New variable. (initialized): New variable. (initialize): New function. (IsCygwinConsoleHandle): New function. (isatty): Invoke it. * doc/posix-functions/isatty.texi: Mention the issue.

#!/bin/sh

# This test is not enabled by default, because MSVCRT does not support and
# will likely never support locales with MB_CUR_MAX > 2.

# Test some UTF-8 locales.
${CHECKER} ./test-wcrtomb-w32${EXEEXT} French_France Japanese_Japan Chinese_Taiwan Chinese_China 65001