Added C/C++ static library builds for Visual Studio 2012 RC.

http://www.smalleranimals.com/zips/I...ibd50_vs12.zip
http://www.smalleranimals.com/zips/I...ibs50_vs12.zip
http://www.smalleranimals.com/zips/I...0_vs12_x64.zip
http://www.smalleranimals.com/zips/I...0_vs12_x64.zip

At this point, since VS2012 has still not been released officially, these should be considered to be experimental. You can use them if you like, but we don't recommend you put them into production.