Description:
------------
ttyname_r() check done in configure is wrong because it relies on doing build on a terminal. Building on non terminal causes failure.

Reproduce code:
---------------
This is test taken from configure:

[arekm@t400 ~/test/3]$ more a.c
#include <unistd.h>
int main(int argc, char *argv[])
{
        char buf[64];

        return ttyname_r(0, buf, 64) ? 1 : 0;
}

[arekm@t400 ~/test/3]$ gcc a.c
[arekm@t400 ~/test/3]$ ./a.out
[arekm@t400 ~/test/3]$ echo $?
0

success - we are on a terminal

[arekm@t400 ~/test/3]$ ./a.out < /dev/null
zsh: exit 1     ./a.out < /dev/null
[arekm@t400 ~/test/3]$ echo $?
1
[arekm@t400 ~/test/3]$

failure - we are not on terminal