[MacPorts] #61942: esound build fails on big sur due to clean_exit

[MacPorts]

#61942: esound build fails on big sur due to clean_exit
--------------------------+----------------------
 Reporter:  ShadSterling  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.4
 Keywords:  bigsur        |       Port:  gtkglext
--------------------------+----------------------
 {{{
 :info:build clients.c:282:6: error: implicit declaration of function
 'clean_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
 :info:build             clean_exit(0);
 :info:build             ^
 :info:build 1 error generated.
 }}}

 This came up in reinstalling everything after moving to Big Sur, esound is
 not requested.

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Ticket URL: <https://trac.macports.org/ticket/61942>
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