turns out we are using a features from more recent versions of cmake than the minimum required...
turns out we are using a features from more recent versions of cmake than the minimum required...

fixes #154

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