[Fix] Do not generate monotouch references in response to MarshalNativeExceptions attribute
[Fix] Do not generate monotouch references in response to MarshalNativeExceptions attribute

The generator was prepending monotouch_ and adding __Internal DllImport references as if linking against monotouch.a. This patch stops the prefix generation on MonoMac which allows a normal import to be generated.

cwensley/maccore,mono/maccore