Fixed warnings in native test code.

tests/Common/Common.h

@@ -47,6 +47,7 @@ public:
     TestPacking8();
     ~TestPacking8();
 };
+#pragma pack()
 
 class DLL_API IgnoredType
 {
@@ -611,7 +612,7 @@ class DLL_API HasOverridenSetter : public TestProperties
 {
 public:
     HasOverridenSetter();
-    void setVirtual(bool value);
+    void setVirtual(bool value) override;
 
     int virtualSetterReturnsBoolean() override;
     bool setVirtualSetterReturnsBoolean(int value) override;

tests/Tests.h

@@ -14,7 +14,12 @@
 #define DLL_API __attribute__ ((visibility ("default")))
 
 #ifndef STDCALL
+#if defined(WINDOWS)
 #define STDCALL __attribute__((stdcall))
+#else
+// warning: calling convention 'stdcall' ignored for this target [-Wignored-attributes]
+#define STDCALL
+#endif
 #endif
 
 #ifndef CDECL