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/patches/arc-2016.03/850-use_shared_libgcc.patch

@@ -0,0 +1,47 @@
+--- a/gcc/config/arm/linux-eabi.h
++++ b/gcc/config/arm/linux-eabi.h
+@@ -131,10 +131,6 @@
+ #define ENDFILE_SPEC \
+   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
+ 
+-/* Use the default LIBGCC_SPEC, not the version in linux-elf.h, as we
+-   do not use -lfloat.  */
+-#undef LIBGCC_SPEC
+-
+ /* Clear the instruction cache from `beg' to `end'.  This is
+    implemented in lib1funcs.S, so ensure an error if this definition
+    is used.  */
+--- a/gcc/config/linux.h
++++ b/gcc/config/linux.h
+@@ -51,6 +51,10 @@ see the files COPYING3 and COPYING.RUNTI
+ 	builtin_assert ("system=posix");			\
+     } while (0)
+ 
++#ifndef LIBGCC_SPEC
++#define LIBGCC_SPEC "%{static|static-libgcc:-lgcc}%{!static:%{!static-libgcc:-lgcc_s}}"
++#endif
++
+ /* Determine which dynamic linker to use depending on whether GLIBC or
+    uClibc or Bionic is the default C library and whether
+    -muclibc or -mglibc or -mbionic has been passed to change the default.  */
+--- a/libgcc/mkmap-symver.awk
++++ b/libgcc/mkmap-symver.awk
+@@ -132,5 +132,5 @@ function output(lib) {
+   else if (inherit[lib])
+     printf("} %s;\n", inherit[lib]);
+   else
+-    printf ("\n  local:\n\t*;\n};\n");
++    printf ("\n\t*;\n};\n");
+ }
+--- a/gcc/config/rs6000/linux.h
++++ b/gcc/config/rs6000/linux.h
+@@ -61,6 +61,9 @@
+ #undef  CPLUSPLUS_CPP_SPEC
+ #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
+ 
++#undef LIBGCC_SPEC
++#define LIBGCC_SPEC "%{!static:%{!static-libgcc:-lgcc_s}} -lgcc"
++
+ #undef  LINK_SHLIB_SPEC
+ #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
+