Don't flip GUID fields when converting to UUID #540
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Part of #537
In #336 we introduced conversions between Windows GUIDs and UUIDs. These didn't attempt to swap the ordering of the fields in any way. GUID specifies its fields as being in the native endianness (which for Windows is basically always little endian), while UUID requires them to be big endian. So we started flipping those fields coming from GUIDs in #345. Unfortunately, this seems like it was the wrong thing to do. All GUIDs I've been able to find already have the right ordering for UUIDs, so we've just been mangling them and losing the UUID version and variant.
This PR fixes that by removing the endianness conversion. We're going to be pulling this out into a separate crate before stabilizing so we can call out the change there. Anybody who actually does want to flip bytes between GUID and UUID fields can use the
from_fields_leandto_fields_lemethods.