fix GLFW location finding on OSX when location is in environment variable
fix GLFW location finding on OSX when location is in environment variable

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