pgsql: Put analyze_keyword back in explain_option_name production.

Put analyze_keyword back in explain_option_name production.

In commit 2c92edad48796119c83d7dbe6c33425d1924626d, I broke "EXPLAIN
(ANALYZE)" syntax, because I mistakenly thought that ANALYZE/ANALYSE were
only partially reserved and thus would be included in NonReservedWord;
but actually they're fully reserved so they still need to be called out
here.

A nicer solution would be to demote these words to type_func_name_keyword
status (they can't be less than that because of "VACUUM [ANALYZE] ColId").
While that works fine so far as the core grammar is concerned, it breaks
ECPG's grammar for reasons I don't have time to isolate at the moment.
So do this for the time being.

Per report from Kevin Grittner. Back-patch to 9.0, like the previous
commit.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/48b5120977e20aef92a080002966ee95e4005d39

Modified Files
--------------
src/backend/parser/gram.y | 1 +
1 file changed, 1 insertion(+)

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