1.0.42.28: package locks to guard against DEFMACRO -> DEFUN and vice-versa

1.0.42.28: package locks to guard against DEFMACRO -> DEFUN and vice-versa

 * Fixes lp#576637.

 * PROCLAIM-AS-FUN-NAME is called quite often at compile time, but actually
   does something we care about only rarely -- assert the lock only when
   something changes, so that

    (WITHOUT-PACKAGE-LOCKS (DEFUN LOCKED:FOO ...))

   keeps working for the common case.

 * Similar logic in %DEFMACRO.

 * Some tests adjusted.