Update llvm-c headers for Version 11.0.1

src/llvm-c/Initialization.h

@@ -16,11 +16,10 @@
 #ifndef LLVM_C_INITIALIZATION_H
 #define LLVM_C_INITIALIZATION_H
 
+#include "ExternC.h"
 #include "Types.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+LLVM_C_EXTERN_C_BEGIN
 
 /**
  * @defgroup LLVMCInitialization Initialization Routines
@@ -49,8 +48,6 @@ void LLVMInitializeTarget(LLVMPassRegistryRef R);
  * @}
  */
 
-#ifdef __cplusplus
-}
-#endif
+LLVM_C_EXTERN_C_END
 
 #endif