pgsql: Remove set-but-not-used variable.

Remove set-but-not-used variable.

In branches before 9.3, commit 8703059c6 caused join_is_legal()'s
unique_ified variable to become unused, since its only remaining
use is for LATERAL-related tests which don't exist pre-9.3.
My compiler didn't complain about that, but Peter's does.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/49232d4191149fd2955e8739a457d70228526dba

Modified Files
--------------
src/backend/optimizer/path/joinrels.c | 4 ----
1 file changed, 4 deletions(-)

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