Create arc-versions.sh for tag arc-2015.12

Signed-off-by: Anton Kolesov <[email protected]>

Author: anthony-kolesov

arc-versions.sh

@@ -77,7 +77,7 @@ done
 # That should be a separate variable to allow for a straightforward creation of
 # new releases, where we want default to point to release, instead of dev
 # branch.
-default_toolchain_config=arc-2015.12-rc1
+default_toolchain_config=arc-2015.12
 
 # Specify the default versions to use as a string <tool>:<branch>. Those are
 # taken from the checkout configuration file. Only actually matters if