[openage-git] fails to build with devtools

[FabioLolix]

Build fine with makepkg instead, not sure what is causing this

GCC is always installed in this situation

-- Performing Test HAVE_REQUIRED_CXX20_SUPPORT
-- Performing Test HAVE_REQUIRED_CXX20_SUPPORT - Failed


The compiler doesn't support required C++20 features:
  * Concepts
  * Default comparisons
The following versions support these features:
  * clang++ >= 10
  * g++ >= 10
  * Microsoft Visual Studio 2019 >= 16.8
Please upgrade your compiler to build openage.


CMake Error at buildsystem/CheckCompilerFeatures.cmake:57 (message):
  aborting
Call Stack (most recent call first):
  CMakeLists.txt:174 (include)

[FabioLolix]

This affect also the rebuild of openage