This process mitigation flag is inherited by child processes and applies
to load-time DLL resolution, pushing the application's own directory
below the system directories. If there are system-installed copies of
dependent DLLs such as FFmpeg, those get loaded when OBS is updated as
the updater and subsequent relaunch of OBS inherit the mitigation.
As we use SetDefaultDllDirectories, this mitigation is less important,
the proper fix would be to use /DEPENDENTLOADFLAG to protect load-time
import resolution.
Richard Stanway
88de106cff