Squashed 'platforms/Cross/plugins/' changes from e678d3a..a25de67

a25de67 [ppc32|ia32]abicc.c: Don't define BytesPerOop or BaseHeaderSize.  These should be taken from interp.h.

git-subtree-dir: platforms/Cross/plugins
git-subtree-split: a25de6753b96eece3ce9737fae5592833ae3ea27
Merge commit '8a3110f628968b37b967fa79d0c01deabd032c25'