Merge "Remove unused variable SKIP_BOOT_JARS_CHECK." am: 1b5262bd69 am: ab70bc55c5 am: 9620d3392d am: 1cb2bf3b7e

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1841576

Change-Id: Ief4bc9731b3d30e9d19779c6e9884bf8eb9c9669