Remove Xcode harness for building the engine

travis/bot.xcodeproj/project.pbxproj

-// !$*UTF8*$!
-{
-	archiveVersion = 1;
-	classes = {
-	};
-	objectVersion = 46;
-	objects = {
-
-/* Begin PBXGroup section */
-		9E687EA21C3C6D9A00FBE171 = {
-			isa = PBXGroup;
-			children = (
-			);
-			sourceTree = "<group>";
-		};
-/* End PBXGroup section */
-
-/* Begin PBXLegacyTarget section */
-		9E687EA71C3C6D9A00FBE171 /* bot */ = {
-			isa = PBXLegacyTarget;
-			buildArgumentsString = travis/build_xcode_sdk.sh;
-			buildConfigurationList = 9E687EAA1C3C6D9A00FBE171 /* Build configuration list for PBXLegacyTarget "bot" */;
-			buildPhases = (
-			);
-			buildToolPath = /bin/sh;
-			buildWorkingDirectory = ..;
-			dependencies = (
-			);
-			name = bot;
-			passBuildSettingsInEnvironment = 1;
-			productName = bot;
-		};
-/* End PBXLegacyTarget section */
-
-/* Begin PBXProject section */
-		9E687EA31C3C6D9A00FBE171 /* Project object */ = {
-			isa = PBXProject;
-			attributes = {
-				LastUpgradeCheck = 0720;
-				ORGANIZATIONNAME = Flutter;
-				TargetAttributes = {
-					9E687EA71C3C6D9A00FBE171 = {
-						CreatedOnToolsVersion = 7.2;
-					};
-				};
-			};
-			buildConfigurationList = 9E687EA61C3C6D9A00FBE171 /* Build configuration list for PBXProject "bot" */;
-			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
-			hasScannedForEncodings = 0;
-			knownRegions = (
-				en,
-			);
-			mainGroup = 9E687EA21C3C6D9A00FBE171;
-			projectDirPath = "";
-			projectRoot = "";
-			targets = (
-				9E687EA71C3C6D9A00FBE171 /* bot */,
-			);
-		};
-/* End PBXProject section */
-
-/* Begin XCBuildConfiguration section */
-		9E687EA81C3C6D9A00FBE171 /* Debug */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-			};
-			name = Debug;
-		};
-		9E687EA91C3C6D9A00FBE171 /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-			};
-			name = Release;
-		};
-		9E687EAB1C3C6D9A00FBE171 /* Debug */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-			};
-			name = Debug;
-		};
-		9E687EAC1C3C6D9A00FBE171 /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-			};
-			name = Release;
-		};
-/* End XCBuildConfiguration section */
-
-/* Begin XCConfigurationList section */
-		9E687EA61C3C6D9A00FBE171 /* Build configuration list for PBXProject "bot" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				9E687EA81C3C6D9A00FBE171 /* Debug */,
-				9E687EA91C3C6D9A00FBE171 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		9E687EAA1C3C6D9A00FBE171 /* Build configuration list for PBXLegacyTarget "bot" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				9E687EAB1C3C6D9A00FBE171 /* Debug */,
-				9E687EAC1C3C6D9A00FBE171 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-/* End XCConfigurationList section */
-	};
-	rootObject = 9E687EA31C3C6D9A00FBE171 /* Project object */;
-}

travis/bot.xcodeproj/project.xcworkspace/contents.xcworkspacedata

-<?xml version="1.0" encoding="UTF-8"?>
-<Workspace
-   version = "1.0">
-   <FileRef
-      location = "self:bot.xcodeproj">
-   </FileRef>
-</Workspace>

travis/bot.xcodeproj/xcshareddata/xcschemes/bot.xcscheme

-<?xml version="1.0" encoding="UTF-8"?>
-<Scheme
-   LastUpgradeVersion = "0720"
-   version = "1.3">
-   <BuildAction
-      parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES">
-      <BuildActionEntries>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "YES"
-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "9E687EA71C3C6D9A00FBE171"
-               BuildableName = "bot"
-               BlueprintName = "bot"
-               ReferencedContainer = "container:bot.xcodeproj">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-      </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
-   </TestAction>
-   <LaunchAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      launchStyle = "0"
-      useCustomWorkingDirectory = "NO"
-      ignoresPersistentStateOnLaunch = "NO"
-      debugDocumentVersioning = "YES"
-      debugServiceExtension = "internal"
-      allowLocationSimulation = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "9E687EA71C3C6D9A00FBE171"
-            BuildableName = "bot"
-            BlueprintName = "bot"
-            ReferencedContainer = "container:bot.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
-   </LaunchAction>
-   <ProfileAction
-      buildConfiguration = "Release"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      savedToolIdentifier = ""
-      useCustomWorkingDirectory = "NO"
-      debugDocumentVersioning = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "9E687EA71C3C6D9A00FBE171"
-            BuildableName = "bot"
-            BlueprintName = "bot"
-            ReferencedContainer = "container:bot.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-   </ProfileAction>
-   <AnalyzeAction
-      buildConfiguration = "Debug">
-   </AnalyzeAction>
-   <ArchiveAction
-      buildConfiguration = "Release"
-      revealArchiveInOrganizer = "YES">
-   </ArchiveAction>
-</Scheme>