Andrew, because you put it there! This was an attachment BEFORE the "heap of patches" email.  It was an added line in:    0001-Add-libav-build-info-to-aboutprefs.C.patch   as seen here:

...

 +const char *AboutPrefs::ffmpeg_version  = " Libav version: " LIBAVCODEC_IDENT;

 AboutPrefs::AboutPrefs(MWindow *mwindow, PreferencesWindow *pwindow)
  : PreferencesDialog(mwindow, pwindow)
@@ -53,7 +56,7 @@ void AboutPrefs::create_objects()

 //     add_subwindow(new BC_Title(mwindow->theme->preferencestitle_x,
 //             mwindow->theme->preferencestitle_y,
-//             _("About"),
+//             _("About"),http://mirrors.pdp-11.ru/
 //             LARGEFONT,
 //             resources->text_default));

...

and then you deleted it in:  0003-Add-Cinelerra-Cv-team-copyright.patch

I was totally confused by this too and hope I got it right in the end and I checked just now to make sure it is not in the current GIT base.