build(ios): enable modules in xcode project, should fix SDK 8+ build

Author: sgtcoolguy

ios/titanium-web-dialog.xcodeproj/project.pbxproj

@@ -221,6 +221,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 24DD6D1B1134B66800162E58 /* titanium.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = NO;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
@@ -264,6 +265,7 @@
 			baseConfigurationReference = 24DD6D1B1134B66800162E58 /* titanium.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = NO;
 				DEPLOYMENT_POSTPROCESSING = YES;