* configure.ac (TAR_COND_GRANTPT): Define conditional depending
on whether grantpt is available.
* gnulib.modules: Remove grantpt. It relies upon a helper binary
pt_chown which it installs and which is useless in the testsuite.
* tests/Makefile.am [TAR_COND_GRANTPT]: Build ttyemu
* tests/iotty.at: Skip test if ttyemu is not build.
* tests/ttyemu.c (noecho): Fix error message
(main): Use TIOCSCTTY if it is defined.
Based on patch from Pavel Raiskup <praiskup@redhat.com>.
* gnulib.modules: Add new modules.
* src/buffer.c (_open_archive): Refuse to read archive from a tty.
* tests/Makefile.am (TESTSUITE_AT): Add iotty.at
(check_PROGRAMS): New program ttyemu
* tests/testsuite.at: Include iotty.at
* tests/iotty.at: New file.
* tests/ttyemu.c: New file.
