Remove unnecessary checks in configure.ac

Original commit to nano: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4553
Original commit message:
2013-01-02 Eitan Adler <lists@eitanadler.com>
        * configure.ac: Remove unnecessary checks
Incorporate support for vim-style lockfiles
Original nano commit:
Original nano commit message:
2012-12-31 Chris Allegretta <chrisa@asty.org>
        * src/*: Introduce (basic) vim-style file locks.  Does not allow vim to recover
          our files, and doesn't yet support setting the file as modified; just lets a
          vim user know we're editing a file.  Commands line "-G" or "--locking", nanorc
          option "locking".  New functions src/files.c:do_lockfile(), write_lockfile(),
          and delete_lockfile().
Fix for lock files
Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4550
Original nano commit message:
Fix trying to lock an un-writable directory.  Just put a message
on the statusbar that we couldn't do it if the user modifies the file.
Changes to do_lockfile and write_lockfile to check for EACCESS and change
the return value of the functions (0 instead of -1)
Set 'modified' bit of lockfile

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4551
Original nano commit message:
Implement the modification bit of the .swp file, put it in the correct actual
location (pos 1007).
Add 'locking' entry to sample pinotrc file

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4552
Original nano commit message:
Add locking entry to sample nanorc
Add prototype for 'write_lockfile'

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4554
Original nano commit message:
Add missing proto for int write_lockfile()
Clean up warnings with -pedantic option

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4555
Original nano commit message:
Clean-up warnings with -pedantic.
Add casts to new nmalloc calls

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4556
Original nano commit message:
Fix impromper calls to nmalloc in new locking implementation.
Remove unused 'dirnamelen' variable

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4558
Original nano commit message:
2013-01-02 Mike Frysinger <vapier@gentoo.org>
        * src/files.c: (cwd_tab_completion): Remove unnecessary variables
Move variable to avoid compiler warning

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4559
Original nano commit message:
2013-01-02 Mike Frysinger <vapier@gentoo.org>
        * src/search.c (search_init): Fix gcc complaints on certain versions
Changes to parse_syntax function

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4560
Original nano commit message:
2013-01-02 David Benjamin <davidben@Savannah>
        * src/search.c (parse_syntax): Fix blatantly and dangerously incorrect  code for
          deleting old syntaxes.
Make search for ncursesw more generalized

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4561
Original nano commit message:
2013-01-09 Fabian Groffen <grobian@Savannah>
        * configure.ac, src/nano.h: Make search for ncursesw more generalized.
Check for ncursesw5-config and base $CPPFLAGS based on it.

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4562
Original nano commit message:
2013-01-02 Mike Frysinger <vapier@gentoo.org>
        * configure.ac: Check for ncursesw5-config and base $CPPFLAGS based on it.
Set 'errno' before strtol() calls

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4563
Original nano commit message:
2013-01-13 Chris Allegretta <chrisa@asty.org>
        * src/utils.c (parse_num): Initalize errno before calling strtol().  Fixes issue
          where trying to go to a line number too long will break legitimate goto-lines
          for the remainder of the editing session, reported by Joshua Rogers.
Make ncursesw check depend on finding ncursesw header

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4564
Original nano commit message:
2013-01-19 Chris Allegretta <chrisa@asty.org>
 * configure.ac: Make ncursesw checking dependent on the presence of ncursesw.h,
          since without the header files we can't compile.
Don't allow sigwinch while justifying text

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4565
Original nano commit message:
 	2013-01-20 Chris Allegretta <chrisa@asty.org>
        * src/text.c (do_histify): Don't allow sigwinch to be received while justifying
          as that puts us into a wacky state.  Fixess crash on justify by Joshua Rogers.
Add --with-wordbounds option to ./configure

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4566
Original nano commit message:
 	        * configure.ac: Added --with-wordbounds option to let cross compilers force
          whether their target system support GNU-style word boundaries or not.
          Originally reported by dave festing.
Additional changes/cleanups to ncursesw checks in ./configure

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4567
Original nano commit message:
2013-01-19 Chris Allegretta <chrisa@asty.org>
        * configure.ac: Make ncurses checking to set $LIBS and check the ncursesw lib
          actually works before defaulting to it over ncurses!  Shock!
Fix type in pinorc man page file

Original nano commit: http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=4568
Original nano commit message:
        * doc/man/nanorc.5: Fix typo in softwrap description, reported by
          cbart387@Savannah.
Update version to 0.0.3