scilab: add pointer conversion builtin functions swig_this & swig_ptr

Examples/test-suite/scilab_pointer_conversion_functions.i

@@ -0,0 +1,16 @@
+%module scilab_pointer_conversion_functions
+
+%inline %{
+
+void* getNull() { return NULL; }
+bool isNull(void *p) { return p == NULL; }
+
+int foo = 3;
+int *pfoo = &foo;
+
+unsigned long getFooAddress() { return (unsigned long) pfoo; }
+bool equalFooPointer(void *p) { return p == pfoo; }
+
+%}
+
+