[boost] Geometry path length breaking windows regression runs

There has been a change to the geometry library, sometime around Nov 14, that is causing the windows regression runners I manage to crash. The issue is that it is creating *very* long filesystem paths, even with the regression --abbreviate-paths option set. There are a bunch of files such as: D:\teeks99-08\run\results\boost\bin.v2\libs\geometry\test\self_contained_headers\self-contained-algorithms-detail-buffer-buffered_piece_collection~hpp.test\msvc-14.1\dbg\adrs-mdl-64\async-excpt-on\thrd-mlt\self-contained-algorithms-detail-buffer-buffered_piece_collection~hpp.obj.rsp That seem to be created alright, but when I try to cleanup the run afterwards, windows doesn't allow me to delete the files. Tom