fix: export more symbols needed by Verso (#4956)

This enables the Verso LSP server extensions to work.

(cherry picked from commit bcbd729)

Author: david-christiansen

src/Lean/Compiler/IR/EmitC.lean

@@ -96,8 +96,13 @@ def shouldExport (n : Name) : Bool :=
   -- libleanshared to avoid Windows symbol limit
   !(`Lean.Compiler.LCNF).isPrefixOf n &&
   !(`Lean.IR).isPrefixOf n &&
-  -- Lean.Server.findModuleRefs is used in Verso
-  (!(`Lean.Server).isPrefixOf n || n == `Lean.Server.findModuleRefs)
+  -- Lean.Server.findModuleRefs is used in SubVerso, and the contents of RequestM are used by the
+  -- full Verso as well as anything else that extends the LSP server.
+  (!(`Lean.Server.Watchdog).isPrefixOf n) &&
+  (!(`Lean.Server.ImportCompletion).isPrefixOf n) &&
+  (!(`Lean.Server.Completion).isPrefixOf n)
+
+
 
 def emitFnDeclAux (decl : Decl) (cppBaseName : String) (isExternal : Bool) : M Unit := do
   let ps := decl.params