trivial: Allow overriding symbol versions where required
trivial: Allow overriding symbol versions where required

If C struct turns to a GObject, we don't always want the _get_type() symbol to
be the same version as the _new() symbol.

fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd