[Bug 271521] x11-toolkits/p5-Tk: fix build with clang 16

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 19 May 2023 20:35:20 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271521

            Bug ID: 271521
           Summary: x11-toolkits/p5-Tk: fix build with clang 16
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: pi@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(pi@FreeBSD.org)
          Assignee: pi@FreeBSD.org

Clang 16 has a new error about incompatible function types, which shows
up when building x11-toolkits/p5-Tk:

  ./Xlib.t:334:14: error: incompatible function pointer types initializing
'KeySym (*)(Display *, unsigned int, int)' (aka 'unsigned long (*)(struct
_XDisplay *, unsigned int, int)') with an expression of type 'KeySym (Display
*, KeyCode, int)' (aka 'unsigned long (struct _XDisplay *, unsigned char,
int)') [-Wincompatible-function-pointer-types]
  VFUNC(KeySym,XKeycodeToKeysym,V_XKeycodeToKeysym,_ANSI_ARGS_((Display *,
unsigned int, int)))
               ^~~~~~~~~~~~~~~~

Indeed, the XKeycodeToKeysum function takes a 'KeyCode' as its second
parameter. Patch Xlib.t to make it so.

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