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

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

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A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=c7823054d431d2e7a0ff064b8c40d51b97156220

commit c7823054d431d2e7a0ff064b8c40d51b97156220
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2022-12-10 16:30:35 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2022-12-12 15:17:02 +0000

    x11-toolkits/pangox-compat: fix build with clang 15

    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.

    PR:             268301
    Approved by:    fluffy (maintainer)
    MFH:            2022Q4

 .../pangox-compat/files/patch-pango-impl-utils.h (new)     | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

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