Fix iOS linker error

ios/AirInAppPurchase.xcodeproj/project.pbxproj

@@ -168,13 +168,16 @@
 			files = (
 			);
 			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
 			);
 			name = "[CP] Check Pods Manifest.lock";
 			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-AirInAppPurchase-checkManifestLockResult.txt",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "diff \"${PODS_ROOT}/../Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n";
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
 			showEnvVarsInLog = 0;
 		};
 /* End PBXShellScriptBuildPhase section */
@@ -283,7 +286,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 73A52F4802CB8303AF16A808 /* Pods-AirInAppPurchase.debug.xcconfig */;
 			buildSettings = {
-				OTHER_LDFLAGS = "-ObjC";
+				CLANG_MODULES_AUTOLINK = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 			};
@@ -293,7 +296,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 4F5EEECECF41468977B23870 /* Pods-AirInAppPurchase.release.xcconfig */;
 			buildSettings = {
-				OTHER_LDFLAGS = "-ObjC";
+				CLANG_MODULES_AUTOLINK = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 			};

ios/Podfile.lock

@@ -1,3 +1,3 @@
 PODFILE CHECKSUM: fbcc8c9cdc1f699c572a377a28c7cc86af711258
 
-COCOAPODS: 1.2.0
+COCOAPODS: 1.3.1