Do 2 passes when "delete all"ing. The first pass removes

all RTF_WASCLONED routes, and the second removes the
others.  This avoids the situation where we've added an
RTF_CLONING route (such as ``default''), created some
clones, then deleted the CLONING route before the
WASCLONED route(s).  Without the two passes, we get
errno (not rtm_errno) set to ESRCH when deleting the
WASCLONED route, despite the deletion succeeding !

Also:
  Enhance the route operation failure diagnostics.
  Make portability #ifdefs a bit more generic.

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