Remove irr namespace (#16309)

irr/src/CGLXManager.h

@@ -16,8 +16,6 @@
 // we can't include glx.h here, because gl.h has incompatible types with ogl es headers and it
 // cause redefinition errors, thats why we use ugly trick with void* types and casts.
 
-namespace irr
-{
 namespace video
 {
 // GLX manager.
@@ -71,6 +69,5 @@ private:
 	XID GlxWin;        // GLXWindow
 };
 }
-}
 
 #endif