loader: Only allow layer in chain once

If an application were to specify a "Validatio" layer
and the environment specified a ParamChecker layer
it was possible to load the same layer twice in
one chain. Layers don't like that can only be referenced
once and that's all they need to support multiple
extensions from the one layer.
This patch adds an alias pointer so that when putting
together the lists of available extensions the loader
can keep track of multiple extensions that are servied
by the same library. Also now create specific
activated_layers_list that contains only the list
of layers that need to be activated.

0 files changed, 0 insertions, 0 deletions