Finish removing DestroySource.

Fixes pr21901.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224782 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm-c/Linker.h

@@ -20,20 +20,13 @@
 extern "C" {
 #endif
 
-
-typedef enum {
-  LLVMLinkerDestroySource = 0, /* Allow source module to be destroyed. */
-  LLVMLinkerPreserveSource = 1 /* Preserve the source module. */
-} LLVMLinkerMode;
-
-
 /* Links the source module into the destination module, taking ownership
  * of the source module away from the caller. Optionally returns a
  * human-readable description of any errors that occurred in linking.
  * OutMessage must be disposed with LLVMDisposeMessage. The return value
  * is true if an error occurred, false otherwise. */
 LLVMBool LLVMLinkModules(LLVMModuleRef Dest, LLVMModuleRef Src,
-                         LLVMLinkerMode Mode, char **OutMessage);
+                         unsigned Unused, char **OutMessage);
 
 #ifdef __cplusplus
 }