Switch to Visual Studio 2012 as the default compiler for builds in the batlab.
===VersionHistory:None===
Added a potential 8.2.0 gotcha item:  new MS Vis St C++ compiler may
cause install of newer runtime.
Merge branch 'V8_2_0-branch' of /p/condor/repository/CONDOR_SRC into V8_2_0-branch
minor 8.2.0 version history item edit #4407
Merge branch 'V8_2_0-branch' into V8_2-branch