[Bug 268812] x11-toolkits/gtk-sharp20: fix build with clang 15

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 07 Jan 2023 15:06:45 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268812

            Bug ID: 268812
           Summary: x11-toolkits/gtk-sharp20: fix build with clang 15
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: mono@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(mono@FreeBSD.org)
          Assignee: mono@FreeBSD.org

During an exp-run for llvm 15 (see bug 265425), it turned out that
x11-toolkits/gtk-sharp20 failed to build with clang 15:

  windowmanager.c:113:12: error: incompatible integer to pointer conversion
assigning to 'gpointer' (aka 'void *') from 'long' [-Wint-conversion]
                  list [i] = data [i];
                           ^ ~~~~~~~~

This is because gdk_property_get() always returns an array of longs, and these
have to be cast to whatever the desired outcome type is.

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