[Bug 268301] x11-toolkits/pangox-compat: fix build with clang 15

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268301

            Bug ID: 268301
           Summary: x11-toolkits/pangox-compat: 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: gnome@FreeBSD.org
          Reporter: dim@FreeBSD.org
          Assignee: gnome@FreeBSD.org
             Flags: maintainer-feedback?(gnome@FreeBSD.org)

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

  pangox.c:983:15: error: incompatible integer to pointer conversion assigning
to 'PangoFontMetrics *' (aka 'struct _PangoFontMetrics *') from 'int'
[-Wint-conversion]
        metrics = pango_font_metrics_new ();
                ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pangox-fontmap.c:944:9: error: incompatible integer to pointer conversion
initializing 'char *' with an expression of type 'int' [-Wint-conversion]
    char *files_str = pango_config_key_get ("PangoX/AliasFiles");
          ^           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is because pangox-compat uses two private functions from the main pango
library, which are not declared in the public pango headers.

Fix the errors by adding the two private functions in pango-impl-utils.h,
copying the declarations from pango-font-private.h and pango-utils-private.h.

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