Changes to work towards compatability with IBM's version of dyninst.

Changes to work towards compatability with IBM's version of dyninst.
major visible change is that the BPatch_{struct,union,function,etc}
enum is now called BPatch_Data{....}.

Also added a bunch of #ifdef IBM_BPATCH_COMPAT to provide
implementations of IBM specific functions (some of which will
probably be moved to our version too).