Remove some ignores from export_targets.py.
Remove some ignores from export_targets.py.

These were fixed upstream.

Bug: angleproject:4077 
Change-Id: I656616a111e1703f8a910c27e6be3ec3e918f6ba
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1899726
Reviewed-by: Jonah Ryan-Davis <682bdb9e7d8ba359ef169b8db374e7a99d394a46@google.com>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle