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.

Description:
gen_tempname() function and try_tempname() function:
create a private temporary file or directory.

Files:
lib/tempname.c
lib/tempname.h
m4/tempname.m4

Depends-on:
extensions
fcntl-h
gettimeofday
lstat
mkdir
stdint
sys_stat
sys_time

configure.ac:
gl_FUNC_GEN_TEMPNAME

Makefile.am:
lib_SOURCES += tempname.c

Include:
"tempname.h"

License:
LGPLv2+

Maintainer:
Eric Blake and Jim Meyering