pgsql: Must check indisready not just indisvalid when dumping from 9.2

Must check indisready not just indisvalid when dumping from 9.2 server.

9.2 uses a kluge representation of "indislive"; we have to account for
that when examining pg_index.  Simplest solution is to check indisready
for 9.0 and 9.1 as well; that's harmless though unnecessary, so it's
not worth making a version distinction for.

Fixes oversight in commit 683abc73dff549e94555d4020dae8d02f32ed78b,
as noted by Andres Freund.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/723acc99bef562cf536d38d0a1967f24e9b4ede0

Modified Files
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src/bin/pg_dump/pg_dump.c |    6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)