Adding additional pre-processor directives for network activity indic…

…ator manager

AFNetworking/AFNetworkActivityIndicatorManager.h

@@ -22,11 +22,14 @@
 
 #import <Foundation/Foundation.h>
 
+#import <Availability.h>
+
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+#import <UIKit/UIKit.h>
+
 /**
  `AFNetworkActivityIndicatorManager` manages the state of the network activity indicator in the status bar. When enabled, it will listen for notifications indicating that a network request operation has started or finished, and start or stop animating the indicator accordingly. The number of active requests is incremented and decremented much like a stack or a semaphore, and the activity indicator will animate so long as that number is greater than zero.
  */
-
-#if __IPHONE_OS_VERSION_MIN_REQUIRED
 @interface AFNetworkActivityIndicatorManager : NSObject {
 @private
 	NSInteger _activityCount;