The ar utility only adds symbols. As a result removed symbols are
sometimes still present in later builds, leading to great confusion.
Delete the .a file before recreating it with ar.
This is similar to what Chromium currently does in gcc_toolchain.gni.
However, we cannot always just use 'rm' because of the build for Android
on Windows, so this introduces 'rm.py' which is just like 'cp.py' but
without the copy part.
Bug: skia:10363
Change-Id: Icc0c3d18dab1e48ccfec47386662c7b4d2dc8811
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/295569
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
