Everywhere: Fix -Winconsistent-missing-override warnings from Clang

This option is already enabled when building Lagom, so let's enable it
for the main build too. We will no longer be surprised by Lagom Clang
CI builds failing while everything compiles locally.

Furthermore, the stronger `-Wsuggest-override` warning is enabled in
this commit, which enforces the use of the `override` keyword in all
classes, not just those which already have some methods marked as
`override`. This works with both GCC and Clang.

1 files changed, 1 insertions, 1 deletions

diff --git a/Userland/Libraries/LibSQL/AST/AST.h b/Userland/Libraries/LibSQL/AST/AST.h
index b0ee4c7262..7dbcb7c389 100644
--- a/Userland/Libraries/LibSQL/AST/AST.h
+++ b/Userland/Libraries/LibSQL/AST/AST.h
@@ -943,7 +943,7 @@ public:
     bool has_selection() const { return !m_select_statement.is_null(); }
     const RefPtr<Select>& select_statement() const { return m_select_statement; }
 
-    RefPtr<SQLResult> execute(ExecutionContext&) const;
+    virtual RefPtr<SQLResult> execute(ExecutionContext&) const override;
 
 private:
     RefPtr<CommonTableExpressionList> m_common_table_expression_list;