Update llvm-c headers for Version 11.0.1

src/llvm-c/Object.h

@@ -19,12 +19,11 @@
 #ifndef LLVM_C_OBJECT_H
 #define LLVM_C_OBJECT_H
 
+#include "ExternC.h"
 #include "Types.h"
 #include "Config/llvm-config.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+LLVM_C_EXTERN_C_BEGIN
 
 /**
  * @defgroup LLVMCObject Object file reading and writing
@@ -226,8 +225,6 @@ LLVMBool LLVMIsSymbolIteratorAtEnd(LLVMObjectFileRef ObjectFile,
  * @}
  */
 
-#ifdef __cplusplus
-}
-#endif /* defined(__cplusplus) */
+LLVM_C_EXTERN_C_END
 
 #endif