chore(demo): update AppAuth dependency in demo ios app

ran `pod update AppAuth` and committed changes

Author: djm158

examples/demo/ios/Example.xcodeproj/project.pbxproj

@@ -572,6 +572,7 @@
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
 					"$(inherited)",
+					_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION,
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
@@ -599,6 +600,11 @@
 					"-DFOLLY_MOBILE=1",
 					"-DFOLLY_USE_LIBCPP=1",
 				);
+				OTHER_LDFLAGS = (
+					"$(inherited)",
+					"-Wl",
+					"-ld_classic",
+				);
 				REACT_NATIVE_PATH = "${PODS_ROOT}/../../node_modules/react-native";
 				SDKROOT = iphoneos;
 			};
@@ -640,6 +646,10 @@
 				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = i386;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"$(inherited)",
+					_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION,
+				);
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
@@ -664,6 +674,11 @@
 					"-DFOLLY_MOBILE=1",
 					"-DFOLLY_USE_LIBCPP=1",
 				);
+				OTHER_LDFLAGS = (
+					"$(inherited)",
+					"-Wl",
+					"-ld_classic",
+				);
 				REACT_NATIVE_PATH = "${PODS_ROOT}/../../node_modules/react-native";
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;