pgsql: regression tests: remove polygon diagrams

regression tests: remove polygon diagrams

The diagrams were inaccurate.

Report by Emre Hasegeli

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/05d1910c1c1f4195065882aa077114bc590b45e3

Modified Files
--------------
src/test/regress/expected/polygon.out | 63 ---------------------------------
src/test/regress/sql/polygon.sql | 63 ---------------------------------
2 files changed, 126 deletions(-)

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