Fix a missing plUUID function in *nix.

Sources/Plasma/NucleusLib/pnUUID/pnUUID_Unix.cpp

@@ -83,6 +83,11 @@ void plUUID::CopyFrom( const plUUID * v )
     memcpy((void*)fData, (const void*)v->fData, sizeof(fData));
 }
 
+void plUUID::CopyFrom(const plUUID& v)
+{
+    memcpy((void*)fData, (const void*)v.fData, sizeof(fData));
+}
+
 int plUUID::CompareTo( const plUUID * v ) const
 {
     uuid_t ga, gb;