Hello!

Since version 3.30.1, one test consistently fails on armhf. It is the
same as in this bug report, although we don't see the exception:

https://bugzilla.mozilla.org/show_bug.cgi?id=1351459

I initially thought this was due to stalls in the build process as we've
seen before and tried increasing the timeouts in a790f2620, but that
should probably be reverted.

What should we do? We can either patch out this test, or go back to
3.30. Here are the release notes for 3.30.1:

https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.30.1_release_notes

It fixes a non-public bug in the base64 implementation, but introduced a
test failure on at least two arches.

Any preference?