Add macro to header files not to be included twice

Signed-off-by: HyukWoo Park <[email protected]>

Author: clover2123

src/runtime/DefinedFunctionTypes.h

@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#ifndef __WalrusDefinedFunctionTypes__
+#define __WalrusDefinedFunctionTypes__
+
 #include "Walrus.h"
 
 namespace Walrus {
@@ -190,3 +193,5 @@ class DefinedFunctionTypes {
 };
 
 } // namespace Walrus
+
+#endif //__WalrusDefinedFunctionTypes__

src/wasi/WASI.h

@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#ifndef __WalrusWASI__
+#define __WalrusWASI__
+
 #include "Walrus.h"
 #include "runtime/Function.h"
 #include "runtime/ObjectType.h"
@@ -161,3 +164,5 @@ class WASI {
 };
 
 } // namespace Walrus
+
+#endif // __WalrusWASI__