[patch] Allow to link with ncursesw

[Matthias Klose]

Triggered by https://launchpad.net/bugs/1275210, to be able to cope with UTF-8
characters in gdbtui. Ok for the trunk?

Matthias

	* configure.ac: Search ncursesw before ncurses.
	Check ncursesw/ncurses.h before ncurses/ncurses.h.
	* gdb_curses.h: Include <ncursesw/ncurses.h>
	* config.in, configure: Regenerate.

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