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FindCurses: use formw in wide mode

Nick Black requested to merge dankamongmen/cmake:dankamongmen/formw-for-wide-curses into master

libform comes in both 8-bit and wide-character variants, just like ncurses. In wide mode, we need to use libformw, both to get wide-character support in libform and to avoid dragging in 8-bit ncurses.

Without this patch, I get:

[schwarzgerat](0) $ ldd outcurses-demo | egrep ncurses\|form
	libncursesw.so.6 => /lib/x86_64-linux-gnu/libncursesw.so.6 (0x00007fe568097000)
	libncurses.so.6 => /lib/x86_64-linux-gnu/libncurses.so.6 (0x00007fe567e65000)
	libform.so.6 => /usr/lib/x86_64-linux-gnu/libform.so.6 (0x00007f2f6f03c000)
[schwarzgerat](0) $

with it, I get:

[schwarzgerat](0) $ ldd outcurses-demo | egrep ncurses\|form
	libncursesw.so.6 => /lib/x86_64-linux-gnu/libncursesw.so.6 (0x00007f581b358000)
	libformw.so.6 => /usr/lib/x86_64-linux-gnu/libformw.so.6 (0x00007f581b315000)
[schwarzgerat](0) $

Fixes: #19883 (closed)
Topic-rename: FindCurses-formw

Edited by Brad King

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