[clang] [clang][AST] fix ast-print of `extern ` with >=2 declarators (PR #93131)

[Erich Keane via cfe-commits]

================
@@ -1145,13 +1145,15 @@ void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl 
*D) {
     l = "C++";
   }
 
+  bool HasMoreThanOneDecl =
+      *D->decls_begin() && D->decls_begin()->getNextDeclInContext();
----------------
erichkeane wrote:

```suggestion
      !D->decls().empty() && (++D->decls_begin() ) != D->decls_end()`
```
WDYT?

https://github.com/llvm/llvm-project/pull/93131
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