Revert "Merge branch 'pyfwdbwd_warning' into 'master'"

This reverts merge request !22104 (merged) (ATLINFR-2605)

Need to revert the patching procedure again as it results in this error in incremental builds:

patching file MANIFEST.in
Reversed (or previously applied) patch detected!  Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file MANIFEST.in.rej
error: Failed to execute patch -p0 -N (return code: 1)

Probably need to force a re-unpacking of the files before attempting a patch as it's done for some of the other external projects.