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Fixes for open.pm which attempts to load layers:
1. C equivalent of local $SIG{__WARN__} = sub {}
while loading layers to supress warnings lib/open.t does
not want.
2. The loading scheme does not recurse now so look for
new symptom of bad layer which is that a good module
fails to load (as we cannot open any files).
NOTE: In my opinion open.pm should probably die on bad layer
spec rather than just (maybe) warning and then allowing opens
to fail.
p4raw-id: //depot/perlio@18560