GN: Fix host_forwarder when is_component=true

tools/android/forwarder2/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
 group("forwarder2") {
   data_deps = [
-    ":host_forwarder($host_toolchain)",
     ":host_forwarder_copy($host_toolchain)",
-    ":device_forwarder($default_toolchain)",
     ":device_forwarder_prepare_dist($default_toolchain)",
   ]
 }
 
 if (current_toolchain == default_toolchain) {
   import("//build/config/android/rules.gni")
 
   # GYP: //tools/android/forwarder2/forwarder.gyp:device_forwarder
   executable("device_forwarder") {
     sources = [
@@ skipping 17 matching lines @@
       "self_deleter_helper.h",
       "socket.cc",
       "socket.h",
       "util.h",
     ]
     deps = [
       "//base",
       "//build/config/sanitizers:deps",
       "//tools/android/common",
     ]
-    data_deps = [ "//build/android/pylib/device/commands" ]
+    data_deps = [
+      "//build/android/pylib/device/commands",
+    ]
   }
 
   # GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
   create_native_executable_dist("device_forwarder_prepare_dist") {
     dist_dir = "$root_build_dir/forwarder_dist"
     binary = "$root_build_dir/device_forwarder"
     deps = [
       ":device_forwarder",
     ]
   }
@@ skipping 24 matching lines @@
       "util.h",
     ]
     deps = [
       "//base",
       "//build/config/sanitizers:deps",
       "//tools/android/common",
     ]
   }
 
   # GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
-  copy("host_forwarder_copy") {
+  action("host_forwarder_copy") {
+    # Symlink rather than copy. When copied and using a component build, it
+    # fails to find libbase.so (since it's actually at clang_x64/libbase.so).
+    script = "//build/symlink.py"
+    _src = "$root_out_dir/host_forwarder"
+    _target = "$root_build_dir/host_forwarder"
     sources = [
-      "$root_out_dir/host_forwarder",
+      _src,
     ]
     outputs = [
-      "$root_build_dir/host_forwarder",
+      _target,
     ]
     deps = [
       ":host_forwarder",
     ]
+    args = [
+      "-f",
+      rebase_path(_src, root_build_dir),
+      rebase_path(_target, root_build_dir),
+    ]
   }
 }