_all_ versions. It tries to remove "Docs/Images/Makefile*" as part of the actions to
correct bug number 6350. If the source tree does not contain a dummy file matching
that pattern, this "rm" will fail, and so "Bootstrap" will fail.
The "Makefile.am" introduced with this changeset is identical to the one that will
arrive in the 5.0 tree when "joerg:1.2057" is propagated from 4.0 via 4.1 to here,
so this separate introduction here is just to allow "Bootstraps" in the meantime.