added AX_WITH_CURSES for more robust ncurses checks

* Turns out that on SunOS/OmniOS the ncurses port does not ship with
  a ncursesw pkg-config file, but the ncurses file is for a version,
  that does contain widechar support as well.
* Instead of adding yet another recursive PKG_CHECK_MODULES() call,
  we now use the AX_WITH_CURSES() macro, which is probably more robust.
  This should at least fix ./configure on OmniOS.
* It also adds a number of feature C macros, that could be useful to
  check in the future.
* At the moment, we strive to support all X/Open-compatible Curses
  libraries, but both enhanced and color functions are required.
  Therefore plain SVr4 Curses is not supported.
* source: https://www.gnu.org/software/autoconf-archive/ax_with_curses.html

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