package/binutils: finalize the bump ARC tools to arc-2017.03-rc2

The commit bumping ARC tools to arc-2017.03-rc2 [1] forgot to
update the ARC tools version in binutils.mk

[1] 043737282010f83e8ec20618a034131bc7e8cae1

Fixes:
http://autobuild.buildroot.net/results/f9c/f9c40610209fc22ac8c0db6bd57bd3b11bbe6d9c

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/binutils/binutils.mk

@@ -9,7 +9,7 @@
 BINUTILS_VERSION = $(call qstrip,$(BR2_BINUTILS_VERSION))
 ifeq ($(BINUTILS_VERSION),)
 ifeq ($(BR2_arc),y)
-BINUTILS_VERSION = arc-2017.03-rc1
+BINUTILS_VERSION = arc-2017.03-rc2
 else
 BINUTILS_VERSION = 2.27
 endif