Differentiator is safe for app extensions

Author: Adrian Schoenig

RxDataSources.xcodeproj/project.pbxproj

@@ -1293,6 +1293,7 @@
 		C82C3C5E1F3B937500309AE8 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
@@ -1315,6 +1316,7 @@
 		C82C3C5F1F3B937500309AE8 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;