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, 2 insertions, 2 deletions

diff --git a/Kernel/Net/NE2000NetworkAdapter.h b/Kernel/Net/NE2000NetworkAdapter.h
index b29d3b514a..f901a934ea 100644
--- a/Kernel/Net/NE2000NetworkAdapter.h
+++ b/Kernel/Net/NE2000NetworkAdapter.h
@@ -31,12 +31,12 @@ public:
         // just assume that it's up.
         return true;
     }
-    virtual i32 link_speed()
+    virtual i32 link_speed() override
     {
         // Can only do 10mbit..
         return 10;
     }
-    virtual bool link_full_duplex() { return true; }
+    virtual bool link_full_duplex() override { return true; }
 
     virtual StringView purpose() const override { return class_name(); }