ffmpeg: upgraded package to upstream

Upgraded media-video/ffmpeg from 4.4-r1 to a later 4.4-r1 that includes
a bugfix for https://bugs.gentoo.org/820095, a bug I filed that affected
chrome OS.
Also upgrade the flag-o-matic eclass to the latest version that does not
make eapi 4 unsupported, to get access to the test-flags-CCLD method.

BUG=b:192612523
TEST=Confirmed that it builds and works as expected.

Change-Id: I6dfa947205a98e7f832f8984bf0e97650354e75a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3244548
Tested-by: Matt Stark <msta@google.com>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Matt Stark <msta@google.com>
3 files changed