[PATCH] Remove MULTI_PTRS_ARE_ALIASES to fix Wundef warning

[Roland McGrath]

I guess for now the inconsistency just makes me want to have the other code
forks around as documentation.  I suppose comments would do it just as
well.  Still my inclination is to make these something like:

/* Insert long new comment about the weirdness and referring to the other
   file where the opposite fork is used in equivalent code.  */
#if 0 /* was MULTI_PTRS_ARE_ALIASES */