Apply upstream patch to fix C99 compatibility issue

Related to:

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

libmatchbox-c99.patch

@@ -0,0 +1,20 @@
+Part of this upstream commit:
+
+commit cb17f478bb102bc437976046ac9d39182aa758aa
+Author: Ross Burton <ross.burton@intel.com>
+Date:   Mon Dec 10 11:33:32 2012 +0000
+
+    Remove some unused variables
+
+diff --git a/libmb/mbpixbuf.c b/libmb/mbpixbuf.c
+index 3811d0874b19fa47..f0da64b0a8aa221d 100644
+--- a/libmb/mbpixbuf.c
++++ b/libmb/mbpixbuf.c
+@@ -22,6 +22,7 @@
+ 
+ #include <strings.h>
+ #include "mbpixbuf.h"
++#include "mbutil.h"
+ 
+ #define BYTE_ORD_24_RGB  0
+ #define BYTE_ORD_24_RBG  1

libmatchbox.spec

@@ -1,12 +1,13 @@
 Summary:        Libraries for the Matchbox Desktop
 Name:           libmatchbox 
 Version:        1.9
-Release:        32%{?dist}
+Release:        33%{?dist}
 Url:            http://projects.o-hand.com/matchbox/
 License:        LGPLv2+
 Source:         http://projects.o-hand.com/matchbox/sources/libmatchbox/%{version}/%{name}-%{version}.tar.bz2
 Patch0:         libmatchbox-1.9-add-needed.patch
 Patch1:		libmatchbox-1.9-libpng.patch
+Patch2: libmatchbox-c99.patch
 BuildRequires:  pango-devel
 BuildRequires:  libpng-devel
 BuildRequires:  libjpeg-devel
@@ -35,6 +36,7 @@ Static libraries and header files from %{name}
 %setup -q
 %patch0 -p1 -b .add-needed
 %patch1 -p1 -b .libpng
+%patch2 -p1
 
 %build
 autoreconf -v --install
@@ -62,6 +64,9 @@ find $RPM_BUILD_ROOT -name '*.a' -exec rm -f {} ';'
 %{_includedir}/libmb/*.h
 
 %changelog
+* Thu Apr 13 2023 Florian Weimer <fweimer@redhat.com> - 1.9-33
+- Apply upstream patch to fix C99 compatibility issue
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1.9-32
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild