Freeze mccabe's version for hacking

mccabe has some drastic changes on master that will not introduce
backwards incompatible behaviour but will make the tool more accurately
compute complexity for various situations. To prevent surprises Joe
Gordon and I have decided to freeze the version now.

Change-Id: I768b785cb61172eb857a7710064e262f007dd138
Merge "Freeze mccabe's version for hacking"