bump libgit2 to b70bf9
bump libgit2 to b70bf9

saraid/rugged,libgit2/rugged,Acidburn0zzz/rugged,spraints/rugged,libgit2/rugged,tpickett66/rugged,saraid/rugged,libgit2/rugged,Acidburn0zzz/rugged,tpickett66/rugged,spraints/rugged,saraid/rugged,tpickett66/rugged,Acidburn0zzz/rugged