Add curses_version() in curses(3)

[Kamil Rytarowski]

Last year, I wrote this patch to add curses_version() for curses(3).

http://netbsd.org/~kamil/patch-00073-curses-version.txt

The only purpose of this function is to get better compat with ncurses
software.

I needed it originally in qemu. It's sometimes used in the wild.

Is it fine to merge it with src/?

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