Port to C99 (#2190017)

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

pygtk2-c99.patch

@@ -0,0 +1,31 @@
+Upstream pango removed these functions from its installed headers in
+this commit:
+
+commit d21ea13a22b1cab8c9cb604aa3fcd2ca8073befd
+Author: Matthias Clasen <mclasen@redhat.com>
+Date:   Thu Jul 4 20:36:00 2019 +0000
+
+    Header cleanup
+    
+    Abolish the PANGO_ENABLE_BACKEND and PANGO_ENABLE_ENGINE
+    defines. All backend-only apis are moved into private
+    headers, all apis that were engine-only are marked as
+    deprecated, since engines are.
+
+diff --git a/pango.override b/pango.override
+index afe43aba3a6ebe81..3e33e1b598322096 100644
+--- a/pango.override
++++ b/pango.override
+@@ -27,6 +27,12 @@ headers
+ #include <pygobject.h>
+ #include <pango/pango.h>
+ 
++/* These internal functions are still exported, so just declare them
++   here.  There does not seem to be a simple way to ween pygtk2 off
++   them.  */
++PangoFontMetrics *pango_font_metrics_new (void);
++const char *pango_font_map_get_shape_engine_type (PangoFontMap *);
++
+ typedef struct {
+     PyObject *func, *data;
+ } PyGtkCustomNotify;

pygtk2.spec

@@ -10,7 +10,7 @@
 
 Name: pygtk2
 Version: 2.24.0
-Release: 39%{?dist}
+Release: 40%{?dist}
 License: LGPL-2.0-or-later
 Summary: Python bindings for GTK+
 URL: http://www.pygtk.org/
@@ -23,6 +23,7 @@ Patch0: 0001-Fix-leaks-of-Pango-objects.patch
 # Fix the build with pango 1.44
 # https://github.com/flathub/org.glimpse_editor.Glimpse/blob/master/patches/pygtk-Drop-the-PangoFont-find_shaper-virtual-method.patch
 Patch1: pygtk-Drop-the-PangoFont-find_shaper-virtual-method.patch
+Patch2: pygtk2-c99.patch
 
 # This was dropped from gnome-python; obsolete it here because, well,
 # we have to put it somewhere
@@ -129,6 +130,9 @@ find %{buildroot} -name '*.la' -or -name '*.a' | xargs rm -f
 %{_datadir}/gtk-doc/html/pygtk/
 
 %changelog
+* Wed Apr 26 2023 Florian Weimer <fweimer@redhat.com> - 2.24.0-40
+- Port to C99 (#2190017)
+
 * Fri Mar 03 2023 Gwyn Ciesla <gwync@protonmail.com> - 2.24.0-39
 - migrated to SPDX license