Fix seg fault using %template

Fix seg fault when instantiating templates with parameters that are function
parameters containing templates, such as:

              %template(MyC) C<int(std::vector<int>)>;

Closes #983

Examples/test-suite/java/template_function_parm_runme.java

@@ -0,0 +1,25 @@
+import template_function_parm.*;
+
+public class template_function_parm_runme {
+
+  static {
+    try {
+      System.loadLibrary("template_function_parm");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String argv[]) {
+    VectorInt vi = new VectorInt();
+    vi.add(10);
+    vi.add(20);
+    vi.add(30);
+
+    MyC myc = new MyC();
+    int sum = myc.take_function(template_function_parmConstants.accumulate_integers, vi);
+    if (sum != 60)
+      throw new RuntimeException("Expected sum of 60, got " + sum);
+  }
+}