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Fixes FreeBSD build on 12.2

Description

Fixes FreeBSD build on 12.2

  • Fix compiler warning with Clang
  • Fix usage of libiconv
  • Fix an incorrect SSE macro in NVTT for SSE

Patch by: @madpilot and Stan
Fixes: #5255
Differential Revision: https://code.wildfiregames.com/D3421