Satisfy compiler warnings about unused parameters.
Satisfy compiler warnings about unused parameters.

In vtr/stackBuffer.h, removed  unnecessary symbols for parameters to silence
compiler warnings about them not being used.

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