* config/i386/tm-x86-64linux.h: New. * config/i386/x86-64linux.mt: Add GDB_MULTI_ARCH and TM_FILE definitions. * config/i386/nm-x86-64.h: Rename to ... * config/i386/nm-x86-64linux.h: ... this one. * config/i386/x86-64linux.mh: Reflect the above change.