putc_unlocked in stdio.h but not in libs (1.3.11-3)

[Marcello Perathoner]

According to the FAQ putc_unlocked is not implemented and you don't find 
it in the libraries. But it is present in the stdio.h header.

Highlander@FOOL ~
$ grep putc_unlocked /usr/include/*.h
/usr/include/stdio.h:int        _EXFUN(putc_unlocked, (int, FILE *));

Highlander@FOOL ~
$ nm /lib/*.a | grep putc_unlocked

Highlander@FOOL ~

How to reproduce:

1. Get diffutils-2.8.1 package and unpack
2. ./configure
3. make

Linker complains about missing function putc_unlocked.

The configure script thinks putc_unlocked is supported, because it is in 
the headers and configure just compiles the test but doesn't try to link 
it against the libs.

Is there something I missed? I just installed cygwin yesterday from 
setup.exe.

Greetings
Marcello

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