Add ET_LOOS and ET_HIOS. Add various EM_* constants. Add SHN_LOOS and SHN_HIOS. Add...

Add ET_LOOS and ET_HIOS. Add various EM_* constants. Add SHN_LOOS and SHN_HIOS. Add SHT_INIT_ARRAY, SHT_FINI_ARRAY, and SHT_PREINIT_ARRAY. Add SHF_MERGE and SHF_STRINGS. (ElfXX_Sym): Update description of st_other field. Add STT_COMMON. Add ELFXX_ST_VISIBILITY and ELFXX_ST_OTHER. Add STV_* macros. Update comment on DT_RPATH.  Add DT_RUNPATH, DT_FLAGS, DT_ENCODING, DT_PREINIT_ARRAY, DT_PREINIT_ARRAYSZ. Add DF_ORIGIN, DF_SYMBOLIC, DF_TEXTREL, and DF_BIND_NOW.