curses(3) symlink is not installed when building out of tree

[Sven Joachim]

When building ncurses out of tree, the curses(3) symlink to the ncurses
manpage does not get installed.  See the attached test script which
prints

Only in /tmp/in-tree.<XXXXXX>/usr/share/man/man3: curses.3ncurses

on my system (on non-Debian systems, it will be curses.3x instead what
is missing).

Looking at the ncurses-doc package on snapshot.debian.org, this feature
has been broken at least since the 20130119 patchlevel, but more likely
since its introduction in the 20110910 patchlevel.

Besides Debian, at least Fedora seems to be affected. In Debian, I have
been creating the missing symlink myself since somebody had asked for it
in https://bugs.debian.org/859293.

Cheers,
       Sven

insttest
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