[lldb] Add terminfo dependency for ncurses support (#126810)

For some operating systems (e.g. chromiumos), terminfo is a separate
package and library from ncurses. Both are still requirements for curses
support in lldb, individually.
    
This is a rework of this original spack commit:

https://github.com/spack/spack/commit/9ea261265010eacd250691a8361f661d0576f25c

Instead though, this PR uses CMake to detect whether the symbol is
present and defined in the curses library, and only falls back to a separate
tinfo if not found.
    
Without this fix, LLDB cannot be built on these systems.
    
Fixes #101368

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