* configure.ac, color.c, rcfile.c, utils.c: 1st attempt at supporting systems which don't support
          GNU-style word boundaries.  New function fixbounds() to translate from GNU-style to
          BSD-style, autoconf option GNU_WORDBOUNDS.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4315 35c25a1d-7b9e-4130-9fde-d3aeb78583b8