Revert "Stop passing -fobjc-arc to linker invocations"

This reverts commit 2685e8d.

Author: owenv

Sources/SWBUniversalPlatform/Specs/Clang.xcspec

@@ -280,6 +280,12 @@
                     );
                     NO = ();
                 };
+                AdditionalLinkerArgs = {
+                    YES = (
+                        "-fobjc-arc",
+                    );
+                    NO = ();
+                };
                 FileTypes = (
                     "sourcecode.c.objc",
                     "sourcecode.cpp.objcpp",

Tests/SWBTaskConstructionTests/TaskConstructionTests.swift

@@ -498,7 +498,7 @@ fileprivate struct TaskConstructionTests: CoreBasedTests {
                     results.checkTask(.matchTarget(target), .matchRule(["WriteAuxiliaryFile", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget.LinkFileList"])) { _ in }
                     results.checkTask(.matchTarget(target), .matchRuleType("Ld")) { task in
                         task.checkRuleInfo(["Ld", "\(SRCROOT)/build/Debug/AppTarget.app/Contents/MacOS/AppTarget", "normal"])
-                        task.checkCommandLine(["clang++", "-Xlinker", "-reproducible", "-target", "\(results.runDestinationTargetArchitecture)-apple-macos\(MACOSX_DEPLOYMENT_TARGET)", "-isysroot", core.loadSDK(.macOS).path.str, "-Os", "-L\(SRCROOT)/build/EagerLinkingTBDs/Debug", "-L\(SRCROOT)/build/Debug", "-F\(SRCROOT)/build/EagerLinkingTBDs/Debug", "-F\(SRCROOT)/build/Debug", "-filelist", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget.LinkFileList", "-Xlinker", "-object_path_lto", "-Xlinker", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget_lto.o", "-Xlinker", "-dependency_info", "-Xlinker", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget_dependency_info.dat", "-fobjc-link-runtime", "-lstatic", "-ldynamic", "-framework", "Framework", "-framework", "AppCore", "-weak_framework", "AppExtensions", "-framework", "Framework-Matched-Included", "-o", "\(SRCROOT)/build/Debug/AppTarget.app/Contents/MacOS/AppTarget"])
+                        task.checkCommandLine(["clang++", "-Xlinker", "-reproducible", "-target", "\(results.runDestinationTargetArchitecture)-apple-macos\(MACOSX_DEPLOYMENT_TARGET)", "-isysroot", core.loadSDK(.macOS).path.str, "-Os", "-L\(SRCROOT)/build/EagerLinkingTBDs/Debug", "-L\(SRCROOT)/build/Debug", "-F\(SRCROOT)/build/EagerLinkingTBDs/Debug", "-F\(SRCROOT)/build/Debug", "-filelist", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget.LinkFileList", "-Xlinker", "-object_path_lto", "-Xlinker", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget_lto.o", "-Xlinker", "-dependency_info", "-Xlinker", "\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/AppTarget_dependency_info.dat", "-fobjc-arc", "-fobjc-link-runtime", "-lstatic", "-ldynamic", "-framework", "Framework", "-framework", "AppCore", "-weak_framework", "AppExtensions", "-framework", "Framework-Matched-Included", "-o", "\(SRCROOT)/build/Debug/AppTarget.app/Contents/MacOS/AppTarget"])
 
                         task.checkInputs([
                             .path("\(SRCROOT)/build/aProject.build/Debug/AppTarget.build/Objects-normal/\(results.runDestinationTargetArchitecture)/SourceFile.o"),