Roll NaCl from 69a0d6e8affc to 0fabd6dc4222 (4 revisions)

https://chromium.googlesource.com/native_client/src/native_client.git/+log/69a0d6e8affc..0fabd6dc4222

2020-10-07 dpranke@google.com Python3-related fixes for NaCl.
2020-10-07 dpranke@google.com Update various DEPS entries.
2020-10-07 sdefresne@chromium.org build: Remove no-op calls to set_sources_assignment_filter
2020-10-06 dschuff@chromium.org Add toolchain_build source target for next-gen LLVM build

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/nacl-autoroll
Please CC mseaborn@chromium.org on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: chromium:1018739,chromium:1112471
Tbr: mseaborn@chromium.org
Change-Id: I56b372aedf934b08460b3ec810983f9a58e3a7bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458831Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#814927}

DEPS

@@ -242,7 +242,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling NaCl
   # and whatever else without interference from each other.
-  'nacl_revision': '69a0d6e8affc94187af10e0673592d1b238c6eb0',
+  'nacl_revision': '0fabd6dc4222dfae664e55a84326e0c904f5b62c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling freetype
   # and whatever else without interference from each other.