libedit: update to snapshot 2023-01-06

MFC atfer: 1 week

libedit: import version of 2022-04-11

It includes improvements in the libreadline compatibility and a change
from pstef@ which fixes filename autocompletion for strings like a\)b

libedit: import snapshot 2021-09-10

Merge ^/head r352105 through r352307.

Readd _el_fn_sh_complete for backward compatibility

This function is not needed anymore, it allows old sh binary to continue
to run and avoid breaking backward compatibility.
Note that is now just c

Readd _el_fn_sh_complete for backward compatibility

This function is not needed anymore, it allows old sh binary to continue
to run and avoid breaking backward compatibility.
Note that is now just calls the regular _el_fn_complete which does a proper
job at quoting.

Discussed with: jilles

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Import libedit 2019-09-10

Compared to current version in base:
- great improvements on the Unicode support
- full support for filename completion including quoting
which means we do not need anymo

Import libedit 2019-09-10

Compared to current version in base:
- great improvements on the Unicode support
- full support for filename completion including quoting
which means we do not need anymore our custom addition)
- Improved readline compatiblity

Upgrading libedit has been a pain in the past, because somehow we never
managed to properly cleanup the tree in lib/libedit and each merge has always
been very painful. After years of fighting give up and refresh a merge from
scrarch properly in contrib.

Note that the switch to this version will be done in another commit.

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