Enable call wasm-c-api native func directly from interpreter (#656)

And update loader error messages for latest spec cases, fix aot compiler build error based on latest LLVM code base.

core/iwasm/compilation/aot_llvm.h

@@ -7,6 +7,7 @@
 #define _AOT_LLVM_H_
 
 #include "aot.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm-c/Types.h"
 #include "llvm-c/Target.h"
 #include "llvm-c/Core.h"