QL code and tests for C#/C++/JavaScript.

cpp/ql/test/library-tests/structs/compatible_cpp/b2.cpp

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+// Definitions of Apple are exactly the same in b1.c and b2.c
+class AppleCompatible {
+  int apple_x;
+};
+
+// Definitions of Banana are compatible but this copy uses a typedef
+typedef int MyInt;
+typedef MyInt IntType;
+class BananaCompatible {
+  IntType banana_x;
+};
+
+// Definitions of Cherry are not compatible - the field types differ
+class Cherry {
+  short cherry_x;
+};
+
+// This shows that we currently only consider member variables, and ignore
+// functions when deciding on class compatibility. In this file there is a
+// member function called `bar`, in b1.cpp there is one called `foo`.
+class Damson {
+  int damson_x;
+  void bar();
+};