Add OpenBSD AArch64 and ARM Little Endian BFD support.

Index: bfd/config.bfd
--- bfd/config.bfd.orig
+++ bfd/config.bfd
@@ -90,7 +90,6 @@ case $targ in
  arm*-*-aout | \
  arm-*-coff | \
  arm*-*-netbsdaout* | \
- arm-*-openbsd* | \
  arm-*-oabi | \
  arm-*-riscix* | \
  arm*-*-symbianelf* | \
@@ -259,6 +258,11 @@ case "${targ}" in
     targ_selvecs="aarch64_elf64_be_vec arm_elf32_le_vec arm_elf32_be_vec"
     want64=true
     ;;
+  aarch64-*-openbsd*)
+    targ_defvec=aarch64_elf64_le_vec
+    targ_selvecs="aarch64_elf64_be_vec arm_elf32_le_vec arm_elf32_be_vec"
+    want64=true
+    ;;
   aarch64-*-fuchsia*)
     targ_defvec=aarch64_elf64_le_vec
     targ_selvecs="aarch64_elf64_be_vec arm_elf32_le_vec arm_elf32_be_vec"
@@ -379,6 +383,10 @@ case "${targ}" in
     targ_selvecs="arm_elf32_le_vec"
     ;;
   arm-*-netbsd*)
+    targ_defvec=arm_elf32_le_vec
+    targ_selvecs="arm_elf32_be_vec"
+    ;;
+  arm-*-openbsd*)
     targ_defvec=arm_elf32_le_vec
     targ_selvecs="arm_elf32_be_vec"
     ;;
