Update to support Xcode 9 and Xcode 10 currently, will upgrade the IDE version in later version

SDWebImage/SDWebImageIndicator.m

@@ -14,6 +14,16 @@
 #import <QuartzCore/QuartzCore.h>
 #endif
 
+#if SD_UIKIT
+#if __IPHONE_13_0 || __TVOS_13_0 || __MAC_10_15
+// Xcode 11
+#else
+// Supports Xcode 9 && 10 users, for those users, define these enum
+static NSInteger UIActivityIndicatorViewStyleMedium = 100;
+static NSInteger UIActivityIndicatorViewStyleLarge = 101;
+#endif
+#endif
+
 #pragma mark - Activity Indicator
 
 @interface SDWebImageActivityIndicator ()