elf: Define ABI_64_P in elf-bfd.h Define ABI_64_P in elf-bfd.h to avoid duplications. * elf-bfd.h (ABI_64_P): New. * elfxx-mips.c (ABI_64_P): Removed. * elfxx-sparc.c (ABI_64_P): Likewise. * elfxx-tilegx.c (ABI_64_P): Likewise. * elfxx-x86.h (ABI_64_P): Likewise. Signed-off-by: H.J. Lu <hjl.tools@gmail.com>