[Chromecast] Include all stdlibc++/libgcc symbols in cast_shell.

build/config/BUILDCONFIG.gn

Index: build/config/BUILDCONFIG.gn
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index 3eed120832f10c091058706af881c439adc0454c..c26ba9d75f5be33375bc7edcc239ac16a2f6a04c 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -484,35 +484,11 @@ if (is_debug) {
   _native_compiler_configs += [ "//build/config:release" ]
 }
 
-# Windows linker setup for EXEs and DLLs.
-if (is_win) {
-  _windows_linker_configs = [
-    "//build/config/win:default_incremental_linking",
-    "//build/config/win:sdk_link",
-    "//build/config/win:common_linker_setup",
-
-    # Default to console-mode apps. Most of our targets are tests and such
-    # that shouldn't use the windows subsystem.
-    "//build/config/win:console",
-  ]
-}
-
 # Executable defaults.
-_executable_configs =
-    _native_compiler_configs + [ "//build/config:default_libs" ]
-if (is_win) {
-  _executable_configs += _windows_linker_configs
-} else if (is_mac) {
-  _executable_configs += [
-    "//build/config/mac:mac_dynamic_flags",
-    "//build/config/mac:mac_executable_flags",
-  ]
-} else if (is_linux || is_android) {
-  _executable_configs += [ "//build/config/gcc:executable_ldconfig" ]
-  if (is_android) {
-    _executable_configs += [ "//build/config/android:executable_config" ]
-  }
-}
+_executable_configs = _native_compiler_configs + [
+                        "//build/config:default_libs",
+                        "//build/config:executable_config",
+                      ]
 set_defaults("executable") {
   configs = _executable_configs
 }
@@ -524,18 +500,11 @@ set_defaults("static_library") {
 
 # Shared library and loadable module defaults (also for components in component
 # mode).
-_shared_library_configs =
-    _native_compiler_configs + [ "//build/config:default_libs" ]
-if (is_win) {
-  _shared_library_configs += _windows_linker_configs
-} else if (is_mac) {
-  _shared_library_configs += [ "//build/config/mac:mac_dynamic_flags" ]
-} else if (is_android) {
-  # Strip native JNI exports from shared libraries by default. Binaries that
-  # want this can remove this config.
-  _shared_library_configs +=
-      [ "//build/config/android:hide_native_jni_exports" ]
-}
+_shared_library_configs = _native_compiler_configs + [
+                            "//build/config:default_libs",
+                            "//build/config:shared_library_config",
+                          ]
+
 set_defaults("shared_library") {
   configs = _shared_library_configs
 }