ncurses: patch libtinfo install prefix to be able to find terminfo db

This patch fixes a bug in ncurses recipe from #146 that rendered it virtually unusable: terminfo databases were installed at `$PREFIX/share/terminfo` being `$HOME/.conda/_build/share/terminfo`. That bug required me to have a built version of ncurses in build directory at all times.

This patch adds a binary patch for `libtinfo.so` and now ncurses binary seem to work for me and my python recipe without any caveats. I'm unsure about patching the exact sofile, it seems fragile, but OTOH ncurses has a pretty stable ABI and thus this may not be an issue.