tango.stdc.posix.dlfcn redundancy (Linux / Darwin version blocks)

The version blocks are a means of documenting which OS a particular declaration applies to, and are used for all declarations where the spec. doesn't completely specify how the thing should be declared. My worry is that if the version blocks are removed from things because they are identical between linux and darwin, as support for other OSes is added we may forget to verify/update some of these. Right now, the presence of the version blocks prevents compilation until the appropriate stuff is defined, so this cannot happen. I know this means the files may end up being somewhat large and contain some duplicate information, but this is the easiest way I can think of to keep them understandable. Tracking down the relevant information for each OS is also sufficiently easy that I don't consider it too much of a problem to fill information in as needed. So while I do appreciate the annoyance that having duplicate declarations, I think it will be worth it in the long run. I'm going to reject this for now.