Disallow input file write access to jdigen.py am: 091ceb2bb2 am: e638766f63 am: 8352906c00 am: 5f746c0bdf

Original change: https://android-review.googlesource.com/c/platform/external/oj-libjdwp/+/1351023

Change-Id: Ief417b3f399e5e15314835682b0a1a972abc678a