Fix the build due to #2064 changes - had to make sure pod lib lint works on macOS as well

SDWebImage/SDWebImageGIFCoder.m

@@ -160,6 +160,9 @@
         return nil;
     }
     
+#ifdef SD_MAC
+    CGImageDestinationAddImage(imageDestination, image.CGImage, nil);
+#else
     if (!image.images) {
         // for static single GIF images
         CGImageDestinationAddImage(imageDestination, image.CGImage, nil);
@@ -178,6 +181,7 @@
             }
         }
     }
+#endif
     
     // Finalize the destination.
     if (CGImageDestinationFinalize(imageDestination) == NO) {

SDWebImage/SDWebImageImageIOCoder.m

@@ -89,6 +89,10 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
         return nil;
     }
     
+#if SD_MAC
+    return [[UIImage alloc] initWithData:data];
+#else
+    
     UIImage *image = [[UIImage alloc] initWithData:data];
     if (!image) {
         return nil;
@@ -111,6 +115,7 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
 #endif
     
     return image;
+#endif
 }
 
 - (UIImage *)incrementallyDecodedImageWithData:(NSData *)data finished:(BOOL)finished {