[MacPorts] #61891: tix @8.4.3_3 +quartz - Build failure - panic implicit declaration causes error

[MacPorts]

#61891: tix @8.4.3_3 +quartz - Build failure - panic implicit declaration causes
error
-----------------------+--------------------
 Reporter:  lmhaffner  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:  bigsur     |       Port:  tix
-----------------------+--------------------
 tix fails to build on macOS 11.x and XCode 12.3 with the new "implicit
 declaration" warning being elevated to a compiler error.

 Example line from the log (attached):

 {{{
 :info:build ./generic/tixDiStyle.c:788:2: error: implicit declaration of
 function 'panic' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 :info:build         panic("DItem is already associated with style");
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61891>
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