(COMMON_OBS): Add exec.o. (annotate.o): Remove extra compile rule. * config/*/*.mh, config/*/*.mt: Remove exec.o from *DEPFILES lists everywhere.
config files moved to an appropriate config/<cpu> subdirectory. * nm-*, xm-*, tm-*: All native, host, and target files, which get linked to nm.h, xm.h, and tm.h respectively by configure, moved to appropriate config/<cpu> subdirectory.