[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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