* Fix issue with latest shellcheck version
The latest shellcheck versions use a new error number for non-POSIX
string replacement. Change to ignore this new error number.
* Ignore shellcheck issue about not following sourced files
Newer shellcheck versions also warn when shellcheck does not follow
sourcing of files with known path:
Not following: ./meta was not specified as input (see shellcheck -x).
We check those files separately so ignore this error for the two scripts
affected.
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