IOS-2656 fixes: crash on startup in Release build

pEpObjCAdapter.xcodeproj/project.pbxproj

@@ -1488,6 +1488,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = NQLYU6MGPN;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_PREPROCESSOR_DEFINITIONS = "IS_IOS_BUILD=1";
 				IPHONEOS_DEPLOYMENT_TARGET = "${inherited}";
 				MTL_FAST_MATH = YES;
 				OTHER_LDFLAGS = "-ObjC";