mimalloc logs on startup before log file is initialized

Steps to reproduce:

1. Run editor/player with redirected stdout
2. Notice this warning message in stdout: `mimalloc: warning: unable to use secure randomness`

This means that we're emitting log messages before the log file is initialized which a cosmetic issue at best and undefined behaviour at worst.

Reproducible with versions: 6000.6.0a8, 6000.7.0a2
Tested on (OS): Windows, macOS