gdi32: Multi-character character constants aren't portable as their behaviour is compiler dependent according to the C standard. Found by sparse.

wined3d: Map vertex sampler numbers to the correct internal array indices for GetTexture and SetTexture.

wined3d: Map vertex sampler numbers to the correct internal array indices for GetSamplerState and SetSamplerState.

rpcrt4: Dereference the pointer passed to the marshaling/unmarshaling/sizing routines in complex types for interface pointers.

rpcrt4: Set PointerBufferMark to the buffer location immediately after the non-pointer data in complex struct and array marshaling and unmarshaling to keep to the DCE/RPC specification.