[development] multisite shared table upgrade enhancements (was what would be more useful)

[Daniel Convissor]

Hi:

I'm looking at /database/updates.inc and see two glaring issues:

1) Some db_type checks only look for 'mysql' not 'mysqli.'  I'll submit a 
patch.

2) Droping columns isn't being done for pgsql because it didn't support 
doing so prior to 7.4.  I'd like to add a database version check inside 
update.inc.  I'm planning on adding the version discovery solely to 
/update.php.  But I'm wondering if the core folks think would find it 
useful (and worth the cost) to add it for all connections via 
/includes/database.*.inc?

Thanks,

--Dan

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