rtorrent: add ncurses dependency
* otherwise fails with:
| checking for NcursesW wide-character library... no
| checking for Ncurses library... no
| checking for Curses library... no
| configure: error: requires either NcursesW or Ncurses library
| Configure failed. The contents of all config.log files follows to aid debugging
(From meta-openembedded rev:
6d72c926e06000c634c221883dee8af8be8f1217)
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>