Merge "Improve error message for dupe srcs in genrule" am: a5969bec06 am: 8d0b528a3c am: 16ff38a997 am: 32c94a20ed

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1850000

Change-Id: Ied314f732f419ded8fdd913bdc6396472e7710fc