Remove the GN *sdk targets

build/config/android/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.
 
 import("//build/config/android/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/sysroot.gni")
 
 assert(is_android)
 
@@ skipping 173 matching lines @@
       rebase_path(android_libgcc_file),
     ]
   }
 
   # Clang with libc++ does not require an explicit atomic library reference.
   if (!is_clang) {
     libs += [ "atomic" ]
   }
 }
 
-config("sdk") {
-  if (sysroot != "") {
-    cflags = [ "--sysroot=" + sysroot ]
-    ldflags = [ "--sysroot=" + sysroot ]
-
-    # Need to get some linker flags out of the sysroot.
-    sysroot_ld_path = rebase_path("//build/config/linux/sysroot_ld_path.py")
-    ldflags += [ exec_script(sysroot_ld_path,
-                             [
-                               rebase_path("//build/linux/sysroot_ld_path.sh"),
-                               sysroot,
-                             ],
-                             "value") ]
-  }
-}
-
 config("executable_config") {
   cflags = [ "-fPIE" ]
   ldflags = [ "-pie" ]
 }
 
 config("hide_native_jni_exports") {
   ldflags = [ "-Wl,--version-script=" +
               rebase_path("//build/android/android_no_jni_exports.lst") ]
 }