os400: build cli manual.

Use PASE perl to run manual generation scripts.

As PASE perl is not aware of all possible input file encoding, convert
all files to UTF-8 upon build sta

os400: build cli manual.

Use PASE perl to run manual generation scripts.

As PASE perl is not aware of all possible input file encoding, convert
all files to UTF-8 upon build start (this might be lengthy).

OS/400 terminal emulation may only offer 76 columns, thus a new -c
parameter has been added to the managen program, defining the allowed
width.

If perl is not available, omit generation and disable online manual.

Closes #14289

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OS400: post-shellcheck changes adjustments

Build scripts must be executed by the os/400 shell (sh), not bash which
is a PASE program.

Shell function get_make_vars() escaping rew

OS400: post-shellcheck changes adjustments

Build scripts must be executed by the os/400 shell (sh), not bash which
is a PASE program.

Shell function get_make_vars() escaping reworked to match $() subcommand
construct.

Follow-up to 8a622baf9e9233241bbe93d6599c99cb46478614
Closes #13366

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OS400: fix shellcheck warnings in scripts

- use `$()` instead of backticks, and re-arrange double-quotes inside.
- add missing `|| exit 1` to `cd` calls. (could be dropped by using `set

OS400: fix shellcheck warnings in scripts

- use `$()` instead of backticks, and re-arrange double-quotes inside.
- add missing `|| exit 1` to `cd` calls. (could be dropped by using `set -eu`.)
- add `-n` to a few `if`s.
- shorten redirections by using `{} >` (as shellcheck recommended).
- silence warnings where variables were detected as unused (SC2034).
- a couple misc updates to silence warnings.
- switch to bash shebang for `-ot` feature.
- split two lines to unbreak syntax highlighting in my editor. (`$(expr \`, `$(dirname \`)

Also enable CI checks for OS/400 shell scripts.

Ref: #13307
Closes #13309

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os400: make programs and command name configurable

Closes #11547

os400: move build configuration parameters to a separate script

They can then easily be overriden in a script named "config400.override"
that is not part of the distribution.

Cl

os400: move build configuration parameters to a separate script

They can then easily be overriden in a script named "config400.override"
that is not part of the distribution.

Closes #11547

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