A symbolic link weechat-curses -> weechat is now created (by both cmake and
configure), so that the /upgrade will work from an old version.
However, if you upgrade from an old version, it is recommended to force the use
of the new binary name with the command: `/upgrade /path/to/weechat` (replace
the path accordingly).
Enchant is enabled only if the new option for cmake (or configure) is enabled:
- for cmake: cmake -DENABLE_ENCHANT=ON
- for configure: ./configure --enable-enchant