Put analyze_keyword back in explain_option_name production.
In commit 2c92edad, 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.
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