File fmt_cxx_standard.patch of Package fmt

diff -uNr fmt-8.0.1.20210808T091846~d57b2a65.orig/CMakeLists.txt fmt-8.0.1.20210808T091846~d57b2a65/CMakeLists.txt
--- fmt-8.0.1.20210808T091846~d57b2a65.orig/CMakeLists.txt	2021-08-08 18:18:46.000000000 +0200
+++ fmt-8.0.1.20210808T091846~d57b2a65/CMakeLists.txt	2021-08-10 08:53:01.076989690 +0200
@@ -1,5 +1,8 @@
 cmake_minimum_required(VERSION 3.1...3.18)
 
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 # Fallback for using newer policies on CMake <3.12.
 if(${CMAKE_VERSION} VERSION_LESS 3.12)
   cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})