Remove the GN *sdk targets

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index ef8fbd4189833f48532fe5e212878041ea6d37ba..31815c367b9981b0c9ab67246fc1a854a7ff7e8b 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -493,10 +493,20 @@ config("runtime_library") {
   # 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" ]
   }