remove `YYDispatchQueuePool` due to dynamic library compile error.

YYWebImage/Cache/YYMemoryCache.m

@@ -15,19 +15,10 @@
 #import <QuartzCore/QuartzCore.h>
 #import <pthread.h>
 
-#if __has_include("YYDispatchQueuePool.h")
-#import "YYDispatchQueuePool.h"
-#endif
 
-#ifdef YYDispatchQueuePool_h
-static inline dispatch_queue_t YYMemoryCacheGetReleaseQueue() {
-    return YYDispatchQueueGetForQOS(NSQualityOfServiceUtility);
-}
-#else
 static inline dispatch_queue_t YYMemoryCacheGetReleaseQueue() {
     return dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0);
 }
-#endif
 
 /**
  A node in linked map.

YYWebImage/YYImageCache.m

@@ -25,25 +25,14 @@
 #import "YYCache.h"
 #endif
 
-#if __has_include("YYDispatchQueuePool.h")
-#import "YYDispatchQueuePool.h"
-#endif
 
 
 static inline dispatch_queue_t YYImageCacheIOQueue() {
-#ifdef YYDispatchQueuePool_h
-    return YYDispatchQueueGetForQOS(NSQualityOfServiceDefault);
-#else
     return dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
-#endif
 }
 
 static inline dispatch_queue_t YYImageCacheDecodeQueue() {
-#ifdef YYDispatchQueuePool_h
-    return YYDispatchQueueGetForQOS(NSQualityOfServiceUtility);
-#else
     return dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0);
-#endif
 }
 
 

YYWebImage/YYWebImageOperation.m

@@ -20,9 +20,6 @@
 #import "YYImage.h"
 #endif
 
-#if __has_include("YYDispatchQueuePool.h")
-#import "YYDispatchQueuePool.h"
-#endif
 
 #define MIN_PROGRESSIVE_TIME_INTERVAL 0.2
 #define MIN_PROGRESSIVE_BLUR_TIME_INTERVAL 0.4
@@ -216,9 +213,6 @@ static void URLInBlackListAdd(NSURL *url) {
 
 /// Global image queue, used for image reading and decoding.
 + (dispatch_queue_t)_imageQueue {
-#ifdef YYDispatchQueuePool_h
-    return YYDispatchQueueGetForQOS(NSQualityOfServiceUtility);
-#else
     #define MAX_QUEUE_COUNT 16
     static int queueCount;
     static dispatch_queue_t queues[MAX_QUEUE_COUNT];
@@ -243,7 +237,6 @@ static void URLInBlackListAdd(NSURL *url) {
     if (cur < 0) cur = -cur;
     return queues[(cur) % queueCount];
     #undef MAX_QUEUE_COUNT
-#endif
 }
 
 - (instancetype)init {