C:\App data / derived cache folder getting huge. Fix?

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From http://www.hourences.com/tutorials-ue4-quick-first-tips/:

*Shader Cache

The engine caches shaders to C:\ no matter where you install. This folder can quickly become 10 GB or more on big projects. To make it write to your project folder instead add following lines to your default engine ini. Shader cache should not be submitted to source control.

[InstalledDerivedDataBackendGraph]
Boot=(Type=Boot, Filename=”%GAMEDIR%DerivedDataCache/Boot.ddc”, MaxCacheSize=512)
Local=(Type=FileSystem, ReadOnly=false, Clean=false, Flush=false, PurgeTransient=true, DeleteUnused=true, UnusedFileAge=34, FoldersToClean=-1, Path=”%GAMEDIR%DerivedDataCache”) *