Build fails with clang 16 from non utf-8 garbage character

[Xenapte]

There is a non utf-8 character on the first line of src/public/tier1/utllinkedlist.h:

//========= Copyright � 1996-2005, Valve Corporation, All rights reserved. ============//

I was able to compile gns successfully with multiple versions of gcc, but only with clang 16 after removing this single character: GameNetworkingSockets/src/public/tier1/utllinkedlist.h:823:1: error: unknown type name 'D$'.