* UTILITIES/org-fixup.el (org-fixup): Let the user override the
version strings produced in org-fixup whith strings stored in
org-fake-release and org-fake-git-version. Skip loading them from a
pre-existing org-version.el or trying to determine them from git in
this case. This is predominantly useful if Git is not available,
but the user wants to install from a Git tarball which is missing a
pre-configured org-version.el file.