toolchain: change default emulation for mips64 (octeon) to n64

fixes several ld errors reported by buildbot:
http://buildbot.openwrt.org:8010/broken_packages/octeon/mdnsresponder/compile.txt
http://buildbot.openwrt.org:8010/broken_packages/octeon/luasocket/compile.txt
http://buildbot.openwrt.org:8010/broken_packages/octeon/luasec/compile.txt
http://buildbot.openwrt.org:8010/broken_packages/octeon/openvswitch/compile.txt
http://buildbot.openwrt.org:8010/broken_packages/octeon/prosody/compile.txt

link error:
 ABI is incompatible with that of the selected emulation

found at OE toolchain for bintils 2.22:
http://patchwork.openembedded.org/patch/28033/

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

SVN-Revision: 45666

toolchain/binutils/patches/linaro/500-Change-default-emulation-for-mips64-linux.patch

@@ -0,0 +1,37 @@
+--- a/bfd/config.bfd
++++ b/bfd/config.bfd
+@@ -1053,12 +1053,12 @@ case "${targ}" in
+     targ_selvecs="bfd_elf32_littlemips_vec bfd_elf64_bigmips_vec bfd_elf64_littlemips_vec ecoff_big_vec ecoff_little_vec"
+     ;;
+   mips64*el-*-linux*)
+-    targ_defvec=bfd_elf32_ntradlittlemips_vec
+-    targ_selvecs="bfd_elf32_ntradbigmips_vec bfd_elf32_tradlittlemips_vec bfd_elf32_tradbigmips_vec bfd_elf64_tradlittlemips_vec bfd_elf64_tradbigmips_vec"
++    targ_defvec=bfd_elf64_tradlittlemips_vec
++    targ_selvecs="bfd_elf32_ntradbigmips_vec bfd_elf32_ntradlittlemips_vec bfd_elf32_tradlittlemips_vec bfd_elf32_tradbigmips_vec bfd_elf64_tradbigmips_vec"
+     ;;
+   mips64*-*-linux*)
+-    targ_defvec=bfd_elf32_ntradbigmips_vec
+-    targ_selvecs="bfd_elf32_ntradlittlemips_vec bfd_elf32_tradbigmips_vec bfd_elf32_tradlittlemips_vec bfd_elf64_tradbigmips_vec bfd_elf64_tradlittlemips_vec"
++    targ_defvec=bfd_elf64_tradbigmips_vec
++    targ_selvecs="bfd_elf32_ntradbigmips_vec bfd_elf32_ntradlittlemips_vec bfd_elf32_tradbigmips_vec bfd_elf32_tradlittlemips_vec  bfd_elf64_tradlittlemips_vec"
+     ;;
+   mips*el-*-linux*)
+     targ_defvec=bfd_elf32_tradlittlemips_vec
+--- a/ld/configure.tgt
++++ b/ld/configure.tgt
+@@ -472,11 +472,11 @@ mips*el-*-vxworks*)	targ_emul=elf32elmip
+ mips*-*-vxworks*)	targ_emul=elf32ebmipvxworks
+ 		        targ_extra_emuls="elf32elmipvxworks" ;;
+ mips*-*-windiss)	targ_emul=elf32mipswindiss ;;
+-mips64*el-*-linux-*)	targ_emul=elf32ltsmipn32
+-			targ_extra_emuls="elf32btsmipn32 elf32ltsmip elf32btsmip elf64ltsmip elf64btsmip"
++mips64*el-*-linux-*)	targ_emul=elf64ltsmip
++			targ_extra_emuls="elf32btsmipn32 elf32ltsmipn32 elf32ltsmip elf32btsmip elf64btsmip"
+ 			targ_extra_libpath=$targ_extra_emuls ;;
+-mips64*-*-linux-*)	targ_emul=elf32btsmipn32
+-			targ_extra_emuls="elf32ltsmipn32 elf32btsmip elf32ltsmip elf64btsmip elf64ltsmip"
++mips64*-*-linux-*)	targ_emul=elf64btsmip
++			targ_extra_emuls="elf32btsmipn32 elf32ltsmipn32 elf32btsmip elf32ltsmip elf64ltsmip"
+ 			targ_extra_libpath=$targ_extra_emuls ;;
+ mips*el-*-linux-*)	targ_emul=elf32ltsmip
+ 			targ_extra_emuls="elf32btsmip elf32ltsmipn32 elf64ltsmip elf32btsmipn32 elf64btsmip"