[gn build] Port 15babba

Author: pcc

llvm/utils/gn/secondary/llvm/lib/ObjCopy/BUILD.gn

@@ -14,6 +14,9 @@ static_library("ObjCopy") {
     "COFF/COFFWriter.cpp",
     "CommonConfig.cpp",
     "ConfigManager.cpp",
+    "DXContainer/DXContainerObjcopy.cpp",
+    "DXContainer/DXContainerReader.cpp",
+    "DXContainer/DXContainerWriter.cpp",
     "ELF/ELFObjcopy.cpp",
     "ELF/ELFObject.cpp",
     "MachO/MachOLayoutBuilder.cpp",