Version of _nc_write_object symbol

[Sven Joachim]

The 20150905 patchlevel introduced a new symbol _nc_write_object tagged
with the version NCURSES_TIC_6.0.current.  I assume that's not the final
version, but is it same to assume that it won't change before a 6.1
prerelease?

I'm asking because the Debian packaging separates programs and
libraries, and I don't want to allow combinations of ncurses-bin and
libtinfo5 that lead to a situation where tic(1) is broken.

Cheers,
       Sven