- Update to final bash 5.1
* Which is mainly the last rc3 veresion
- Add official patch bash51-001
There is a missing dependency on a constructed file, which can cause highly
parellel builds to fail.
- Add official patch bash51-002
If there are no jobs, and the `-n' and `-p' options are both supplied to
`wait', bash can assign a value to the variable name specified with `-p'
instead of leaving it unset.
- Add official patch bash51-003
Bash does not put a command substitution process that is started to perform an
expansion in a child process into the right process group where it can receive
keyboard-generated signals.
- Add official patch bash51-004
If a key-value compound array assignment to an associative array is supplied
as an assignment statement argument to the `declare' command that declares the
array, the assignment doesn't perform the correct word expansions.
This patch makes key-value assignment and subscript assignment perform the
same expansions when they're supplied as an argument to `declare'.

- Update to bash 5.1 rc3
* The `assoc_expand_once' option now affects the evaluation of the -v primary
to test and the [[ compound command.

- Update to bash 5.1 rc2
* Process substitutions started from an interactive shell no longer have their
standard input implicitly redirected from /dev/null.
* Fixed an issue with setting the SIGINT trap handler in an interactive shell
when temporarily running $PROMPT_COMMAND non-interactively.