The log2 function does not exist in on older Android. Using FMath::Log2 instead solves the issue.

Steps to Reproduce

1. Package project for Android
2. Install and try to run on Android version less than 4.4.x

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ComponentUE - Platform - Mobile
Affects Versions4.16
Target Fix4.16.34.17
Fix Commit3511630
Main Commit3600450
Release Commit3523549
CreatedJun 27, 2017
ResolvedJun 27, 2017
UpdatedSep 16, 2019