[lldb][Docs] Add Curses version note to build page This explains a thing that hit me on FreeBSD because the base system has an ncursesw at one version and I installed from pkg another version that was simply ncurses (no wide char support). For whatever reason, when we pass -lcurses to the linker it ends up picking bits of both installs. This led to lldb crashing immediately if you tried to use the `gui` command. In a way that gave little information but I stumbled onto https://github.com/vifm/vifm/issues/325 which is very similar. ``` ec2-user@freebsd:~/build-llvm $ ldd ./bin/lldb | grep curses libncursesw.so.9 => /lib/libncursesw.so.9 (0x6a515206e000) libncurses.so.6 => /usr/local/lib/libncurses.so.6 (0x6a5158e86000) ``` We should only see one version, and it and libpanel etc should all have "w" or not have "w". This was not the case for my build. What I can see from the CMake side seemed fine, it found the pkg installed ncurses in /usr/local. Something else must decide that -lcurses should pull in the other one. Regardless, I don't know how to fix that but the solution for most people is just not to add another ncurses if they already have one. So I've added a note saying so, and how to check what your lldb is using.
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