GunCon: Add relative pointer binding

src/util/input_manager.h

@@ -326,9 +326,6 @@ void SetMacroButtonState(u32 pad, u32 index, bool state);
 /// Returns true if the raw input source is being used.
 bool IsUsingRawInput();
 
-/// Returns true if any bindings are present which require relative mouse movement.
-bool HasPointerAxisBinds();
-
 /// Restores default configuration.
 void SetDefaultSourceConfig(SettingsInterface& si);
 
@@ -359,4 +356,7 @@ void OnInputDeviceConnected(const std::string_view& identifier, const std::strin
 
 /// Called when an input device is disconnected.
 void OnInputDeviceDisconnected(const std::string_view& identifier);
+
+/// Enables "relative" mouse mode, locking the cursor position and returning relative coordinates.
+void SetMouseMode(bool relative, bool hide_cursor);
 } // namespace Host