Revert "cctools: bump to latest commit"

This reverts commit ac682e36.

This broke iOS building on master. Even Xcode 8.2 comes with TAPI
librarises. We need these patches to support those .tbd files.
Eventually we will move to using libtapi directly, but I have not
finished work on this right now.

Unfortunately, this will not have my changes for building cctools with
manpages. We will have to do this update at some later time.