DTRT with {beginning,end}-of-defun

[Dave L. <fx...@gn...>]

{beginning,end}-of-defun-function should be bound appropriately to
DTRT in Emacs, at least.

There's a comment in cc-mode.el about not binding \e\C-a, \e\C-e,
saying that rms said not to.  I don't know whether that's just because
it's not the right way to do it and maybe it dates from before I added
the hooks, but the current situation is clearly wrong.  As you
doubtless realize, C-M-a fails completely with K&R style, and it
doesn't even go to the actual beginning of the function with GNU
style, just the outer brace.

I've been annoyed by that for a long time, but I don't think I
realized that the CC basic support was there.  This patch sets things
up appropriately for Emacs.  The hooks aren't in XEmacs, so that won't
be affected.