Accepting request 921459 from home:AZhou:branches:multimedia:libs

- Add ffmpeg-CVE-2020-22037.patch: Backport from upstream to fix
  denial of service vulnerability exists due to a memory leak in
  avcodec_alloc_context3 at options.c (bsc#1186756).

OBS-URL: https://build.opensuse.org/request/show/921459
OBS-URL: https://build.opensuse.org/package/show/multimedia:libs/ffmpeg-4?expand=0&rev=170

ffmpeg-4.spec

@@ -121,6 +121,7 @@ Patch9:         ffmpeg-4.4-CVE-2020-22046.patch
 Patch10:        ffmpeg-CVE-2021-33815.patch
 Patch11:        ffmpeg-CVE-2021-38114.patch
 Patch12:        ffmpeg-CVE-2021-38171.patch
+Patch13:        ffmpeg-CVE-2020-22037.patch
 BuildRequires:  ladspa-devel
 BuildRequires:  libgsm-devel
 BuildRequires:  libmp3lame-devel