Bash is built with its own libreadline, not using ours

While working on a pipeline based on this, I noticed many linking errors of
our installed Bash, complaining that it can't link with libreadline. This
was while readline was present in the proper directory and the Bash within
a recipe would work properly.

After some investigation, I found out that this is because Make's `foreach'
function (which was used to define the targets) was apparently calling Bash
without setting `LD_LIBRARY_PATH', causing this error.

To avoid such sitations, Bash now uses its internal build of readline and
we no longer ask it to link with the installed readline.

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