Add wide character support to grotty.

This is a huge patch, mainly by adding the gnulib infrastructure in
a separate directory tree (in `src/libs/gnulib/lib') for its
`wcwidth' module.  However, the actual changes to native groff
source files are just a few lines.

* Makefile.comm (INCLUDES): Updated.
(LIBGNU): Define.

* Makefile.in (NOMAKEDIRS): Updated.
(GNULLIBDIRS): Define.
(DISTDIRS): Add GNULLIBDIRS.
($LIBDIRS): Depend on GNULLIBDIRS.
($GNULLIBDIRS): New target.

* src/libs/libgroff/font.cpp (font::get_width, font::load)
[is_unicode]: Use `wcwidth'.

* src/roff/troff/Makefile.sub (XLIBS): Add LIBGNU.
* src/roff/troff/input.cpp (main): Set LC_CTYPE.

* src/devices/grotty/Makefile.sub (XLIBS): Add LIBGNU.
* src/devices/grotty/tty.cpp (main): Set LC_CTYPE.

* src/libs/gnulib/*: New files.  The import was done as follows:

  . Call

      gnulib-tool --create-testdir \
                  --dir=src/libs/gnulib \
                  wcwidth

    to get a testbed.

  . Manually move directories src/libs/gl{lib,m4} to
    src/libs/{lib,m4}, and do s/gllib/lib/ and s/glm4/m4/ everywhere
    to `convert' the gnulib testbed to a standard gnulib
    configuration as maintained by gnulib-tool.

  . Call

      gnulib-tool --add-import \
                  --dir=src/libs/gnulib \
                  wcwidth

    to update everything.

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