* config/tc-avr.c: Remove atxmega16x1.
Enable rthreads support on OpenBSD/amd64.

gdb/ChangeLog:

        * amd64obsd-nat.c (_initialize_amd64obsd_nat): Call
        obsd_add_target instead of add_target.
        * config/i386/obsd64.mh (NATDEPFILES): Add obsd-nat.o.
Enable rthreads support on OpenBSD/mips64.

gdb/ChangeLog:

        * mips64obsd-nat.c: Include "obsd-nath".
        (_initialize_mips64obsd_nat): Call obsd_add_target instead of
        add_target
        * config/mips/obsd64.mh (NATDEPFILES): Add obsd-nat.o.
Fix ChangeLog.
ld-arm/long-plt-format.d, ld-arm/arm-elf.exp: Adjust for arm-eabi.
Eliminate pointer signedness warning.

gdb/ChangeLog:

        * i386obsd-nat.c (i386obsd_supply_pcb): Cast 'sf' to 'gdb_byte *'.
Enable rhreads support on OpenBSD/i386.

gdb/ChangeLog:

        * i386obsd-nat.c: Include "obsd-nat.h".
        (_initialize_i386obsd_nat): Call obsd_add_target instead of
        add_target.
        * config/i386/obsd.mh (NATDEPFILES): Add obsd-nat.o.
Silence ARI warning.

gdb/ChangeLog:

        * obsd-nat.c: Include "gdb_wait.h" instead of <sys/wait.h>.
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