Dion Hulse 61122743e2 Don't upgrade global tables to utf8mb4 when DO_NOT_UPGRADE_GLOBAL_TABLES is defined.
This change also standardises on only checking `DO_NOT_UPGRADE_GLOBAL_TABLES` is defined, not it's value.

Fixes #32154 for 4.2

Built from https://develop.svn.wordpress.org/branches/4.2@33059


git-svn-id: http://core.svn.wordpress.org/branches/4.2@33030 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-07-03 05:59:27 +00:00
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