[Bug 272019] graphics/ocaml-lablgl: fix build with clang 16

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272019

            Bug ID: 272019
           Summary: graphics/ocaml-lablgl: 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: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org

Clang 16 has a new error about incompatible function types, which shows
up when building graphics/ocaml-lablgl:

  togl.c:820:26: error: incompatible function pointer types assigning to 'void
(*)(Tk_Window, Tk_ClassProcs *, ClientData)' (aka 'void (*)(struct Tk_Window_
*, struct Tk_ClassProcs *, void *)') from 'void (Tk_Window, const Tk_ClassProcs
*, ClientData)' (aka 'void (struct Tk_Window_ *, const struct Tk_ClassProcs *,
void *)') [-Wincompatible-function-pointer-types]
          SetClassProcsPtr = Tk_SetClassProcs;
                           ^ ~~~~~~~~~~~~~~~~

This is because Tk_SetClassProcs() now takes a const Tk_ClassProcs
pointer as its second parameter. Fix the SetClassProcsPtr declaration to
match.

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