Wean gdb and sim off private libbfd.h header

The major reason this header was needed, bfd_default_set_arch_mach,
has now moved to bfd.h.

gdb/
	* amd64-darwin-tdep.c: Don't include libbfd.h.
	* i386-darwin-tdep.c: Likewise.
	* rs6000-nat.c: Likewise.
	* rs6000-tdep.c: Likewise.
sim/aarch64/
	* memory.c: Don't include libbfd.h.
sim/rl78/
	* load.c: Don't include libbfd.h.
	(rl78_load): Don't use private iovec seek or read.
sim/rx/
	* load.c: Don't include libbfd.h.
	(rx_load): Don't use private iovec seek or read.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2016-07-27  Alan Modra  <amodra@gmail.com>
+
+	* amd64-darwin-tdep.c: Don't include libbfd.h.
+	* i386-darwin-tdep.c: Likewise.
+	* rs6000-nat.c: Likewise.
+	* rs6000-tdep.c: Likewise.
+
 2016-07-26  Tom Tromey  <tom@tromey.com>
 
 	* symtab.c (register_symbol_computed_impl): Update.

gdb/amd64-darwin-tdep.c

@@ -26,7 +26,6 @@
 #include "floatformat.h"
 #include "symtab.h"
 #include "regcache.h"
-#include "libbfd.h"
 #include "objfiles.h"
 
 #include "i387-tdep.h"

gdb/i386-darwin-tdep.c

@@ -26,7 +26,6 @@
 #include "floatformat.h"
 #include "symtab.h"
 #include "regcache.h"
-#include "libbfd.h"
 #include "objfiles.h"
 
 #include "i387-tdep.h"

gdb/rs6000-nat.c

@@ -23,7 +23,6 @@
 #include "gdbcore.h"
 #include "symfile.h"
 #include "objfiles.h"
-#include "libbfd.h"		/* For bfd_default_set_arch_mach (FIXME) */
 #include "bfd.h"
 #include "gdb-stabs.h"
 #include "regcache.h"

gdb/rs6000-tdep.c

@@ -43,7 +43,6 @@
 #include "record-full.h"
 #include "auxv.h"
 
-#include "libbfd.h"		/* for bfd_default_set_arch_mach */
 #include "coff/internal.h"	/* for libcoff.h */
 #include "libcoff.h"		/* for xcoff_data */
 #include "coff/xcoff.h"

sim/aarch64/ChangeLog

@@ -1,3 +1,7 @@
+2016-07-27  Alan Modra  <amodra@gmail.com>
+
+	* memory.c: Don't include libbfd.h.
+
 2016-07-21  Nick Clifton  <nickc@redhat.com>
 
 	* simulator.c (fsqrts): Use sqrtf rather than sqrt.

sim/aarch64/memory.c

@@ -26,7 +26,6 @@
 #include <string.h>
 
 #include "bfd.h"
-#include "libbfd.h"
 #include "libiberty.h"
 #include "elf/internal.h"
 #include "elf/common.h"

sim/rl78/ChangeLog

@@ -1,3 +1,8 @@
+2016-07-27  Alan Modra  <amodra@gmail.com>
+
+	* load.c: Don't include libbfd.h.
+	(rl78_load): Don't use private iovec seek or read.
+
 2016-01-10  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.

sim/rl78/load.c

@@ -29,7 +29,6 @@
 #include "bfd.h"
 #include "elf-bfd.h"
 #include "elf/rl78.h"
-#include "libbfd.h"
 #include "cpu.h"
 #include "mem.h"
 #include "load.h"
@@ -140,13 +139,13 @@ rl78_load (bfd *prog, host_callback *callbacks, const char * const simname)
       buf = xmalloc (size);
 
       offset = p->p_offset;
-      if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0)
+      if (bfd_seek (prog, offset, SEEK_SET) != 0)
 	{
 	  fprintf (stderr, "%s, Failed to seek to offset %lx\n", simname, (long) offset);
 	  continue;
 	}
 
-      if (prog->iovec->bread (prog, buf, size) != size)
+      if (bfd_bread (buf, size, prog) != size)
 	{
 	  fprintf (stderr, "%s: Failed to read %lx bytes\n", simname, size);
 	  continue;

sim/rx/ChangeLog

@@ -1,3 +1,8 @@
+2016-07-27  Alan Modra  <amodra@gmail.com>
+
+	* load.c: Don't include libbfd.h.
+	(rx_load): Don't use private iovec seek or read.
+
 2016-04-27  Nick Clifton  <nickc@redhat.com>
 
 	PR target/20000

sim/rx/load.c

@@ -25,7 +25,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <string.h>
 
 #include "bfd.h"
-#include "libbfd.h"
 #include "cpu.h"
 #include "mem.h"
 #include "load.h"
@@ -146,12 +145,12 @@ rx_load (bfd *prog, host_callback *callback)
 	}
       
       offset = p->p_offset;
-      if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0)
+      if (bfd_seek (prog, offset, SEEK_SET) != 0)
 	{
 	  fprintf (stderr, "Failed to seek to offset %lx\n", (long) offset);
 	  continue;
 	}
-      if (prog->iovec->bread (prog, buf, size) != size)
+      if (bfd_bread (buf, size, prog) != size)
 	{
 	  fprintf (stderr, "Failed to read %lx bytes\n", size);
 	  continue;