Update Fedora build to latest version.

Author: ggbecker

.github/workflows/build.yaml

@@ -24,10 +24,10 @@ jobs:
           popd
 
   build-fedora:
-    name: Build on Fedora 33 (Container)
+    name: Build on Fedora Latest (Container)
     runs-on: ubuntu-latest
     container:
-      image: fedora:33
+      image: fedora:latest
     steps:
       - name: Install Deps
         run: dnf install -y cmake gcc-c++ openssh-clients util-linux openscap-devel qt5-qtbase-devel qt5-qtxmlpatterns-devel openssh-askpass asciidoc polkit-libs

CMakeLists.txt

@@ -142,6 +142,8 @@ if (WIN32)
     configure_file("win32-LICENSE.rtf" "${CMAKE_CURRENT_BINARY_DIR}/win32-LICENSE.rtf" COPYONLY)
 endif()
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
+
 # Enforce std=c++11 for old gcc versions to fix build in RHEL 7
 if (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU" AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 4.9)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")