Those wrappers are no longer necessary to produce PIE binaries.

We need to allow JavaScript on `about:cache` explicitly. Otherwise it is
broken on higher security levels.

With the changes to integrate Selfrando (#20683), we are using our build
of gcc and binutils to build other libraries in the linux/gitian-utils.yml
descriptor, which removed the use of the hardening wrappers. We fix that
by adding the hardening wrappers to our builds of gcc and binutils.
Because we add the wrappers to gcc and binutils zip files, we don't need
to add them anymore in the other descriptors where they are used.

This reverts commit f27d2cab4ed80a4c7b4f594b593b6b90f6148a82.

The problem was the script for recreating the .dmg files after the
code-signing set the permissions wrong. No need to fix anything in the
bundle descriptor.

We don't ship the clearkey DRM system yet, thus we don't need to strip
the respective binaries.

We need to allow JavaScript on `about:tabcrashed` pages explicitly.
Otherwise are those pages broken on higher security levels.