Recognize "*.os" files as object files.
Recognize "*.os" files as object files.

This is the default extension used by SCons for object files with
position-independent code for inclusion in shared libraries.

SRI-CSL/whole-program-llvm,travitch/whole-program-llvm,travitch/whole-program-llvm,travitch/whole-program-llvm,SRI-CSL/whole-program-llvm,BenjaminSchubert/whole-program-llvm,riyadparvez/whole-program-llvm,BenjaminSchubert/whole-program-llvm,SRI-CSL/whole-program-llvm,SRI-CSL/whole-program-llvm,riyadparvez/whole-program-llvm,BenjaminSchubert/whole-program-llvm,riyadparvez/whole-program-llvm,travitch/whole-program-llvm,BenjaminSchubert/whole-program-llvm,riyadparvez/whole-program-llvm,SRI-CSL/whole-program-llvm