[MacPorts] #61459: gpac @0.8.0_1 fails to build on Big Sur

[MacPorts]

#61459: gpac @0.8.0_1 fails to build on Big Sur
--------------------+--------------------
 Reporter:  Tatsh   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gpac
--------------------+--------------------
 {{{
 vtt_dec.c:136:3: error: implicit declaration of function
 'gf_webvtt_js_removeCues' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
                 gf_webvtt_js_removeCues(vttdec->sg->RootNode);
                 ^
 vtt_dec.c:143:5: error: implicit declaration of function
 'gf_webvtt_js_addCue' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
                                 gf_webvtt_js_addCue(vttdec->sg->RootNode,
 cue->id, start, end, cue->settings, cue->text);
                                 ^
 2 errors generated.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61459>
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