[Merge] lp:~mir-team/platform-api/support-state-changing into lp:platform-api

[Robert Carr]

Updated symbols file.

Jump from 3-5 is because it seems Gerry previously released 2.4.0 (see debian/changelog) but did not updated the cmake list.
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https://code.launchpad.net/~mir-team/platform-api/support-state-changing/+merge/235545
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