Remove the GN *sdk targets

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/toolchain/ccache.gni")
 
 if (current_cpu == "arm") {
@@ skipping 475 matching lines @@
 
 config("runtime_library") {
   defines = []
   configs = []
 
   # System-specific flags. If your compiler flags apply to one of the
   # categories here, add it to the associated file to keep this shared config
   # smaller.
   if (is_win) {
     configs += [ "//build/config/win:runtime_library" ]
+  } else if (is_linux) {
+    configs += [ "//build/config/linux:runtime_library" ]
+  } else if (is_ios) {
+    configs += [ "//build/config/ios:runtime_library" ]
+  } else if (is_mac) {
+    configs += [ "//build/config/mac:runtime_library" ]
   } else if (is_android) {
     configs += [ "//build/config/android:runtime_library" ]
   }
 
+  if (is_posix) {
+    configs += [ "//build/config/posix:runtime_library" ]
+  }
+
   if (is_component_build) {
     defines += [ "COMPONENT_BUILD" ]
   }
 }
 
 # default_warning_flags collects all warning flags that are used by default.
 # This is in a variable instead of a config so that it can be used in
 # both chromium_code and no_chromium_code.  This way these flags are guaranteed
 # to appear on the compile command line after -Wall.
 
@@ skipping 628 matching lines @@
   if (symbol_level == 0) {
     configs = [ ":no_symbols" ]
   } else if (symbol_level == 1) {
     configs = [ ":minimal_symbols" ]
   } else if (symbol_level == 2) {
     configs = [ ":symbols" ]
   } else {
     assert(false)
   }
 }