Fixed VS2010 build warning/error
Fixed VS2010 build warning/error

takahito-tejima/OpenSubdiv-exp,shengfuintel/OpenSubdiv,c64kernal/OpenSubdiv,takahito-tejima/OpenSubdiv,anshuarya/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,poljere/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,xldeveloper/OpenSubdiv,lookup1980/OpenSubdiv,c64kernal/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,nyotis/OpenSubdiv,jcowles/OpenSubdiv,c64kernal/OpenSubdiv,xldeveloper/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,anshuarya/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,poljere/OpenSubdiv,anshuarya/OpenSubdiv,xldeveloper/OpenSubdiv,poljere/OpenSubdiv,shengfuintel/OpenSubdiv,jcowles/OpenSubdiv,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv