Fix VS2008 makefile for Windows 7 "ren" command issues.
Fix VS2008 makefile for Windows 7 "ren" command issues.
patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin