fix for gcc 10

error after updating to gcc 10.3.1:
src/zimg/colorspace/matrix3.cpp:45:7: error: 'size_t' was not declared in this scope; did you mean 'std::size_t'?
    45 |  for (size_t i = 0; i < 3; ++i) {
       |       ^~~~~~
       |       std::size_t
 In file included from /usr/include/c++/10.3.1/utility:68,
                  from /usr/include/c++/10.3.1/array:38,
                  from src/zimg/colorspace/matrix3.h:6,
                  from src/zimg/colorspace/matrix3.cpp:1:

refer to: https://bugs.gentoo.org/721676

gcc-10.patch

@@ -0,0 +1,7 @@
+--- src/zimg/colorspace/matrix3.cpp_old	2021-08-02 16:27:28.737949184 +0800
++++ src/zimg/colorspace/matrix3.cpp	2021-08-02 16:27:48.394167745 +0800
+@@ -1,3 +1,4 @@
++#include <cstddef>
+ #include "matrix3.h"
+ 
+ namespace zimg {

zimg.spec

@@ -1,11 +1,12 @@
 Name:           zimg
 Version:        2.9.3
-Release:        1
+Release:        2
 Summary:        Scaling, color space conversion, and dithering library
 License:        WTFPL
 URL:            https://github.com/sekrit-twc/zimg
 
 Source0:        %{url}/archive/release-%{version}/%{name}-%{version}.tar.gz
+Patch0:         gcc-10.patch
 
 BuildRequires:  autoconf automake gcc-c++ libtool
 
@@ -27,7 +28,7 @@ The %{name}-devel package contains libraries and header files for
 developing applications that use %{name}.
 
 %prep
-%autosetup -n zimg-release-%{version}
+%autosetup -n zimg-release-%{version} -p0
 
 %build
 autoreconf -vif
@@ -60,5 +61,8 @@ rm -fr %{buildroot}%{_docdir}/%{name}
 %{_libdir}/pkgconfig/%{name}.pc
 
 %changelog
+* Mon Aug 02 2021 linjiaxin5 <linjiaxin5@huawei.com> - 2.9.3-2
+- Fix failure caused by GCC upgrade to 10
+
 * Fri May 07 2021 weidong <weidong@uniontech.com> - 2.9.3-1
 - Initial package.