* osabi.c: Include "gdb_assert.h" and "gdb_string.h".

* osabi.c: Include "gdb_assert.h" and "gdb_string.h".
(struct gdb_osabi_handler): Remove member `arch'.  Add member
`arch_info'.
(gdbarch_register_osabi): Add new argument `machine'.  Use ot to
construct a `struct bfd_arch_info' and store it in the `struct
gdb_osabi_handler' that is created.
(gdbarch_init_osabi): Check for compatibility based on machine
type and architecture.
* osabi.h (gdbarch_register_osabi): Adjust prototype and update
comment.
* alpha-linux-tdep.c (_initialize_alpha_linux_tdep): Add 0 as
second argument in call to gdbarch_register_osabi.
* alpha-osf1-tdep.c (_initialize_alpha_osf1_tdep): Likewise.
* alphafbsd-tdep.c (_initialize_alphafbsd_tdep): Likewise.
* alphanbsd-tdep.c (_initialize_alphanbsd_tdep): Likewise.
* arm-linux-tdep.c (_initialize_arm_linux_tdep): Likewise.
* arm-tdep.c (_initialize_arm_tdep): Likewise.
* armnbsd-tdep.c (_initialize_armnbsd_tdep): Likewise.
* hppa-hpux-tdep.c (_initialize_hppa_hpux_tdep): Likewise.
* i386-interix-tdep.c (_initialize_i386_interix_tdep): Likewise.
* i386-linux-tdep.c (_initialize_i386_linux_tdep): Likewise.
* i386-sol2-tdep.c (_initialize_i386_sol2_tdep): Likewise.
* i386-tdep.c (_initialize_i386_tdep): Likewise.
* i386bsd-tdep.c (_initialize_i386bsd_tdep): Likewise.
* i386gnu-tdep.c (_initialize_i386gnu_tdep): Likewise.
* i386ly-tdep.c (_initialize_i386lynx_tdep): Renamed from
_initialize_i386bsd_tdep and updated likewise.
* i386nbsd-tdep.c (_initialize_i386nbsd_tdep): Likewise.
* i386obsd-tdep.c (_initialize_i386obsd_tdep): Likewise.
* mips-irix-tdep.c (_initialize_mips_irix_tdep): Likewise.
* mips-linux-tdep.c (_initialize_mips_linux_tdep): Likewise.
* mipsnbsd-tdep.c (_initialize_mipsnbsd__tdep): Likewise.
* ns32knbsd-tdep.c (_initialize_ns32kmnsd_tdep): Likewise.
* ppc-linux-tdep.c (_initialize_ppc_linux_tdep): Likewise.
* ppcnbsd-tdep.c (_initialize_ppcnbsd_tdep): Likewise.
* shnbsd-tdep.c (_initialize_shnbsd_tdep): Likewise.
* sparcnbsd-tdep.c (_initialize_sparcnbsd_tdep): Likewise.