The patch for "Bug#27621546 CANNOT UNINSTALL MYSQL SERVER IF MS VC++
REDIST IS REMOVED FIRST" changes the wix files so that generation of
msi packages no longer have a "custom action". The MySQL Cluster
installer have a "custom action" post install step which runs the
mcc/post-install.py file. After above patch, the custom action will
no longer run.

Examination of post-install.py shows that the only thing it does is
to unpack a file called dojo.zip, that file is supposed to be inside
the msi package. However there are no dojo.zip file and thus the
"custom action" post install step has no effect.

Remove unused code for unpacking dojo.zip and other remnants
of code which where used in the past when a dojo.zip file
part of the package. Don't touch anything in packacking/WiX/ca
since that will be removed by the above mentioned patch.