Move javac_wrapper.sh scripts into own files. am: 9de71a4e46 am: ff4a137df8

Original change: https://android-review.googlesource.com/c/platform/art/+/2057472

Change-Id: I0d929ce887e80f7ee79f213fcbaf0bd9e84fdbb8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>