Fix gdb version to be more precise. r=bustage

--HG--
extra : transplant_source : %15%ED%EAqR%1C%B8wZ%EE%7E%18%25%116K%3D0%C0%86
Bug 983314 - symlink /builds/tooltool.py for non-mock usage; r=dustin
Merge default -> production

--HG--
branch : production