Define a java_runtime and toolchain bazel targets for JDK11. am: 992225cabf am: 0ea3f19e14

Original change: https://android-review.googlesource.com/c/platform/prebuilts/jdk/jdk11/+/1788471

Change-Id: Ibc62ddaf9b37dc9d5c7e329f75c2c81055547627
tree: 332e914d84e7cc212d7f01dece671e4367e1b397
  1. darwin-x86/
  2. linux-x86/
  3. manifest.xml
  4. update.sh