Make sure we build for C++20

AMBuildScript

@@ -102,7 +102,7 @@ class SDKConfig(object):
     ]
 
     cxx.cxxflags += [
-      '-std=c++17'
+      '-std=c++20'
     ]
 
     if builder.options.opt == '1':
@@ -117,7 +117,7 @@ class SDKConfig(object):
       cxx.defines += ['COMPILER_MSVC64']
     
     cxx.cxxflags += [
-      '/std:c++17',
+      '/std:c++20',
       '/WX'
     ]