toolchain: Bump ARC tools to arc-2016.03

This change switches ARC tools to the most recent arc-2016.03
version.

ARC GNU tools of version arc-2016.03 bring some quite significant
changes like:
 * Binutils v2.26+ (upstream commit id 202ac19 with additional ARC
 * patches)
 * GCC v4.8.5
 * GDB 7.10

More about changes, improvements and fixes could be found here:
https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/tag/arc-2016.03

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

toolchain/gcc/Config.version

@@ -5,7 +5,7 @@ config GCC_VERSION_4_8_ARC
 config GCC_VERSION
 	string
 	default "4.8-linaro"    if GCC_VERSION_4_8_LINARO
-	default "arc-2015.06"   if GCC_VERSION_4_8_ARC
+	default "arc-2016.03"   if GCC_VERSION_4_8_ARC
 	default "5.3.0"
 
 config GCC_VERSION_4_8

toolchain/gcc/common.mk

@@ -33,11 +33,11 @@ ifeq ($(PKG_VERSION),5.3.0)
 endif
 
 ifneq ($(CONFIG_GCC_VERSION_4_8_ARC),)
-    PKG_VERSION:=4.8.4
-    PKG_SOURCE_URL:=https://github.com/foss-for-synopsys-dwc-arc-processors/gcc/archive/arc-2015.06
+    PKG_VERSION:=4.8.5
+    PKG_SOURCE_URL:=https://github.com/foss-for-synopsys-dwc-arc-processors/gcc/archive/arc-2016.03
     PKG_SOURCE:=$(PKG_NAME)-$(GCC_VERSION).tar.gz
-    PKG_MD5SUM:=25007ebb02a5f6c32532b103bb5984a0
-    PKG_REV:=2015.06
+    PKG_MD5SUM:=ca59c8140d6efd07b97a18869bddbb53
+    PKG_REV:=2016.03
     GCC_DIR:=gcc-arc-$(PKG_REV)
     HOST_BUILD_DIR = $(BUILD_DIR_HOST)/$(PKG_NAME)-$(GCC_VERSION)
 endif