bring own minimal Preferences headers

PrefsBundle/PrefsViewController.m

@@ -32,12 +32,18 @@
 // adapted from Ryan Petrich's Activator preferences bundle
 // https://github.com/rpetrich/libactivator/blob/master/Preferences.m
 
-#import <Preferences/Preferences.h>
+
 #import <UIKit/UIKit.h>
 
 #import "BluetoothTableViewAdapter.h"
 #import "BluetoothController.h"
 
+// instead of #import <Preferences/Preferences.h>, minimal class definition
+@interface PSViewController : NSObject
+- (id)initForContentSize:(CGSize)size;
+- (id)navigationItem;
+@end
+
 @interface PSViewController (OS32)
 @property (nonatomic, retain) UIView *view;
 - (void)viewDidLoad;