Failure to load native assembly into .NET process

[AaronRobinsonMSFT]

The following is too restrictive when loading a DNNE native binary into a process with an already loaded .NET Core instance.

DNNE/src/platform/platform.c

Lines 280 to 283 in ab8340c

	static bool is_failure(int rc)
	{
	return (rc != DNNE_SUCCESS);
	}

A return value of 1 (S_FALSE) is returned if the initialization succeeded due to an existing runtime instance.