Remove the GN *sdk targets

build/config/android/BUILD.gn

Index: build/config/android/BUILD.gn
diff --git a/build/config/android/BUILD.gn b/build/config/android/BUILD.gn
index 0514b43e73b308e967227404bad6e1cccb44822f..bb78230fd449c41b9a118b39caa5b8bd5d8887de 100644
--- a/build/config/android/BUILD.gn
+++ b/build/config/android/BUILD.gn
@@ -191,22 +191,6 @@ config("runtime_library") {
   }
 }
 
-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" ]