Updated Xcode library version to match libtool output with Ozkan's change

Xcode/SDL/SDL.xcodeproj/project.pbxproj

@@ -3157,7 +3157,7 @@
 				CLANG_LINK_OBJC_RUNTIME = NO;
 				COMBINE_HIDPI_IMAGES = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1.0.0;
-				DYLIB_CURRENT_VERSION = 8.0.0;
+				DYLIB_CURRENT_VERSION = 9.0.0;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(PROJECT_DIR)",
@@ -3251,7 +3251,7 @@
 				CLANG_LINK_OBJC_RUNTIME = NO;
 				COMBINE_HIDPI_IMAGES = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1.0.0;
-				DYLIB_CURRENT_VERSION = 8.0.0;
+				DYLIB_CURRENT_VERSION = 9.0.0;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(PROJECT_DIR)",