[CMake] Remove the symlink to Xcode's arclite libraries.

With 877b51d, we'll find them using 'xcrun' if Swift isn't located next
to Clang.

CMakeLists.txt

@@ -77,7 +77,7 @@ set(SWIFT_ENABLE_GOLD_LINKER FALSE CACHE BOOL
     "Enable using the gold linker when available")
 
 set(_SWIFT_KNOWN_INSTALL_COMPONENTS
-    "compiler;clang-builtin-headers;clang-resource-dir-symlink;clang-builtin-headers-in-clang-resource-dir;clang-libclang;arclite-symlink;stdlib;stdlib-experimental;sdk-overlay;editor-integration;tools;testsuite-tools;dev;sourcekit-xpc-service;sourcekit-inproc")
+    "compiler;clang-builtin-headers;clang-resource-dir-symlink;clang-builtin-headers-in-clang-resource-dir;clang-libclang;stdlib;stdlib-experimental;sdk-overlay;editor-integration;tools;testsuite-tools;dev;sourcekit-xpc-service;sourcekit-inproc")
 
 # Set the SWIFT_INSTALL_COMPONENTS variable to the default value if it is not passed in via -D
 set(SWIFT_INSTALL_COMPONENTS "${_SWIFT_KNOWN_INSTALL_COMPONENTS}" CACHE STRING

stdlib/public/SwiftShims/CMakeLists.txt

@@ -84,28 +84,6 @@ add_custom_command_target(unused_var
     COMMENT "Symlinking Clang resource headers into ${SWIFTLIB_DIR}/clang")
 add_dependencies(copy_shim_headers symlink_clang_headers)
 
-include(SwiftDarwin)
-if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
-  # Symlink in arclite from the XcodeDefault toolchain.
-  get_default_toolchain_dir(toolchain_dir)
-  add_custom_command_target(unused_var
-      COMMAND
-        "${CMAKE_COMMAND}" "-E" "make_directory"
-        "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib"
-      COMMAND
-        "${CMAKE_COMMAND}" "-E" "create_symlink"
-        "${toolchain_dir}/usr/lib/arc"
-        "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/arc"
-      CUSTOM_TARGET_NAME "symlink_arclite"
-      OUTPUT "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/arc"
-      COMMENT "Symlinking toolchain's arclite into ${SWIFTLIB_DIR}/arc")
-  add_dependencies(copy_shim_headers symlink_arclite)
-
-  swift_install_in_component(arclite-symlink
-      DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/arc"
-      DESTINATION "lib")
-endif()
-
 swift_install_in_component(compiler
     FILES ${sources}
     DESTINATION "lib/swift/shims")