[boost] boost dll versions

I think it is a bit unfortunate that we don't have a system to determine whether boost updates break existing api's. The usual process is that, for example, suppose we have libboost.so.1.33.0 Let's assign this soname libboost.so.1. Then a symlink is created libboost.so.1 -> libboost.so.1.33.0. Now if a bugfix comes out that does not change the api, be can have libboost.so.1.33.1, which also has soname libboost.so.1, and then symlink: libboost.so.1 -> libboost.so.1.33.1 OK, so that's the background. AFAICT, we (boost) don't have any way to tell if a new release breaks existing api, and whether to up the version. I think that is unfortunate. I don't really know what to do about it, though.