Bug 1478005 - Enable AV1 for non-Nightly builds; r=drno

Summary:
AV1 is still preffed off by default and is still disabled for Android and
32 bit Windows.

Reviewers: drno

Tags: #secure-revision

Bug #: 1478005

Differential Revision: https://phabricator.services.mozilla.com/D2362

--HG--
extra : rebase_source : dc7cc50453dabb13d7abf2f1cd6eb39bb4c11f78

toolkit/moz.configure

@@ -393,13 +393,13 @@ imply_option('--enable-fmp4', ffmpeg, '--enable-ffmpeg')
 option('--enable-av1',
         help='Enable libaom for av1 video support')
 
-@depends('--enable-av1', target, milestone)
-def av1(value, target, milestone):
+@depends('--enable-av1', target)
+def av1(value, target):
     enabled = bool(value)
     if value.origin == 'default':
         if target.os == 'WINNT' and target.cpu == 'x86':
             enabled = False
-        elif milestone.is_nightly:
+        else:
             enabled = target.os != 'Android'
     if enabled:
         return True