crossgcc: Update gcc to 5.2.0

All compilers built, incl. x86_64-elf as multilib and riscv-elf.

Change-Id: Iafa61b1d2ffc9c737ab67a417c62417593b69372
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/10975
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/crossgcc/patches/gcc-5.2.0_elf_biarch.patch

@@ -1,6 +1,6 @@
 diff -urN gcc-4.9.2/gcc/config/i386/t-elf64 gcc-4.9.2/gcc/config/i386/t-elf64
 --- gcc-4.9.2/gcc/config/i386/t-elf64	1969-12-31 16:00:00.000000000 -0800
-+++ gcc-4.9.2/gcc/config/i386/t-elf64	2015-06-17 11:20:08.032513005 -0700
++++ gcc-5.2.0/gcc/config/i386/t-elf64	2015-06-17 11:20:08.032513005 -0700
 @@ -0,0 +1,38 @@
 +# Copyright (C) 2002-2014 Free Software Foundation, Inc.
 +#
@@ -42,7 +42,7 @@ diff -urN gcc-4.9.2/gcc/config/i386/t-elf64 gcc-4.9.2/gcc/config/i386/t-elf64
 +MULTILIB_OSDIRNAMES+= mx32=../libx32$(call if_multiarch,:x86_64-elf-x32)
 diff -urN gcc-4.9.2/gcc/config.gcc gcc-4.9.2/gcc/config.gcc
 --- gcc-4.9.2/gcc/config.gcc	2015-06-17 11:20:57.841008182 -0700
-+++ gcc-4.9.2/gcc/config.gcc	2015-06-17 11:17:24.818890200 -0700
++++ gcc-5.2.0/gcc/config.gcc	2015-06-17 11:17:24.818890200 -0700
 @@ -1353,6 +1353,30 @@
  	;;
  x86_64-*-elf*)