Add osl_relatiom and osl_vector_relatiom
Add osl_st4tement and osl_vector_st4tement
Add osl_sc0p
Add osl_scop_body extension
Add osl_scop_coordinates extension (.h only)
Add osl_scop_scatnames extension (.h only)
Add osl_scop_unknown extension
Add osl/scop/extension.h