chore: use c++17

Author: triniwiz

v8ios.xcodeproj/project.pbxproj

@@ -2578,7 +2578,7 @@
 		C2DDEB2A229EA89200345BFE /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				CLANG_CXX_LANGUAGE_STANDARD = "compiler-default";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++17";
 				CLANG_CXX_LIBRARY = "compiler-default";
 				CLANG_ENABLE_MODULES = NO;
 				CODE_SIGN_IDENTITY = "Apple Development";
@@ -2627,7 +2627,7 @@
 		C2DDEB2B229EA89200345BFE /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				CLANG_CXX_LANGUAGE_STANDARD = "compiler-default";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++17";
 				CLANG_CXX_LIBRARY = "compiler-default";
 				CLANG_ENABLE_MODULES = NO;
 				CODE_SIGN_IDENTITY = "Apple Development";