Make update: Allow amd64 architecture

Apparently, the 65bit Intel architecture is presented differently
on Linux and Windows.

Allow both variants for the command line, so that semantically the
command line argument can be seen as a lower case platform.machine.

build_files/utils/make_update.py

@@ -42,7 +42,7 @@ def parse_arguments() -> argparse.Namespace:
     parser.add_argument("--svn-branch", default=None)
     parser.add_argument("--git-command", default="git")
     parser.add_argument("--use-linux-libraries", action="store_true")
-    parser.add_argument("--architecture", type=str, choices=("x86_64", "arm64",))
+    parser.add_argument("--architecture", type=str, choices=("x86_64", "amd64", "arm64",))
     return parser.parse_args()