curses: Use cursesw instead of curses

# curses probe

if test "$curses" != "no" ; then

  if test "$mingw32" = "yes" ; then

    curses_list="$($pkg_config --libs ncurses 2>/dev/null):-lpdcurses"

    curses_inc_list="$($pkg_config --cflags ncurses 2>/dev/null):"

    curses_lib_list="$($pkg_config --libs ncurses 2>/dev/null):-lpdcurses"

  else

    curses_list="$($pkg_config --libs ncurses 2>/dev/null):-lncurses:-lcurses"

    curses_inc_list="$($pkg_config --cflags ncursesw 2>/dev/null):"

    curses_lib_list="$($pkg_config --libs ncursesw 2>/dev/null):-lncursesw:-lcursesw"

  fi

  curses_found=no

  cat > $TMPC << EOF

#include <locale.h>

#include <curses.h>

#include <wchar.h>

int main(void) {

  const char *s = curses_version();

  wchar_t wch = L'w';

  setlocale(LC_ALL, "");

  resize_term(0, 0);

  addwstr(L"wide chars\n");

  addnwstr(&wch, 1);

  return s != 0;

}

EOF

  IFS=:

  for curses_lib in $curses_list; do

  for curses_inc in $curses_inc_list; do

    for curses_lib in $curses_lib_list; do

      unset IFS

    if compile_prog "" "$curses_lib" ; then

      if compile_prog "$curses_inc" "$curses_lib" ; then

        curses_found=yes

        QEMU_CFLAGS="$curses_inc $QEMU_CFLAGS"

        libs_softmmu="$curses_lib $libs_softmmu"

        break

      fi

    done

  done

  unset IFS

  if test "$curses_found" = "yes" ; then

    curses=yes