Bugfix external find --all for libraries (#31186)

* Fixed a bug in the 'external find --all' command where the call failed
to find packages by both executable and library. The bug was that the
call `path.all_packages()` incorrectly turned the variable
`packages_to_check` into a generator rather than keeping it a list.
Thus the second call to `detection.by_library` had no work to do.

* Fixed the help message for the find external and compiler commands as
well as others that used the `scopes_metavar` field to define where
the results should be stored in configuration space.  Specifically,
the fact that configuration could be added to the environment was not
mentioned in the help message.

0 files changed, 0 insertions, 0 deletions