put header files in a slightly more consistent order

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1304 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

configure.ac

@@ -15,7 +15,7 @@ AC_SYS_LARGEFILE
 
 dnl Checks for header files.
 AC_HEADER_STDC
-AC_CHECK_HEADERS(fcntl.h getopt.h libintl.h limits.h termio.h termios.h regex.h unistd.h)
+AC_CHECK_HEADERS(fcntl.h getopt.h libintl.h limits.h regex.h termio.h termios.h unistd.h)
 
 dnl options
 AC_ARG_ENABLE(debug,