the gb_Postprocess* foo could also be in gb_Module* as it is
conceptionally close ('do things globally/productwide'). OTOH I see no
obvious reason for e.g. signing not to be done right along with building
a lib/executable anyway instead of in postprocess. The same is likely
true for the other stuff too.

Change-Id: I9c8f569564c056643af7ca39bfe038ed228dcd3d
Reviewed-on: https://gerrit.libreoffice.org/2426Reviewed-by: Matúš Kukan <matus.kukan@gmail.com>
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>