#4884 Remove DECLARE_* translator callback macros

[David Kastrup]

Remove DECLARE_* translator callback macros

Recent changes have rendered them trivial. This does not review their
accessibility status: in general, they should be protected since they
can be reused by derived classes but aren't needed externally.

http://codereview.appspot.com/301890043

[David Kastrup]

Pushed to staging as
commit 0dcde4fc13c8091439fb8e2d77ea755357a0e7ed
Author: David Kastrup dak@gnu.org
Date: Sun Jun 5 18:52:47 2016 +0200

Issue 4884: Remove DECLARE_* translator callback macros

Recent changes have rendered them trivial.  This does not review their
accessibility status: in general, they should be protected since they
can be reused by derived classes but aren't needed externally.  However,
where they are indeed called from static member functions of derived
classes, the associated trampoline instantiation appears to require
public access.  This might warrant some more investigation.