Saleem Abdulrasool 1b850a2afd build: improve libedit handling for builds ...

Use the FindLibEdit.cmake module from LLDB to properly control where
the libedit libraries are searched for and linked from as well as where
the headers come from. This uses the standard mechanisms which allows
users to control where libedit is pulled from (which is important for
cross-compilation).

This second version is more aggressive about pruning the libedit
handling.  The Ubuntu 14.04 version of libedit does not have
`histedit.h`, and the intent is to rely on that to determine if we have
unicode support or not.

2019-12-29 16:32:49 -08:00

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