[clang] [Clang] strengthen checks for 'main' function to meet [basic.start.main] p3 requirements (PR #101853)

[via cfe-commits]

================
@@ -12210,7 +12215,22 @@ bool Sema::CheckFunctionDeclaration(Scope *S, 
FunctionDecl *NewFD,
   return Redeclaration;
 }
 
-void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
+void Sema::CheckMain(FunctionDecl *FD, const DeclSpec &DS) {
+  // [basic.start.main]p3
+  //    The main function shall not be declared with a linkage-specification.
+  if ((FD->isExternCContext() || FD->isExternCXXContext())) {
----------------
Sirraide wrote:

```suggestion
  if (FD->isExternCContext() || FD->isExternCXXContext()) {
```

https://github.com/llvm/llvm-project/pull/101853
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