Auto merge of #23977 - servo:jdm-patch-46, r=Manishearth

Use correct openxr loader path for x64

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python/servo/build_commands.py

@@ -756,7 +756,7 @@ def package_openxr_dlls(self, env, servo_exe_dir, target):
         target_arch = target.split('-')[0]
         if target_arch == "aarch64":
             arch = "arm64"
-        elif target_arch == "x64":
+        elif target_arch == "x86_64":
             arch = "x64"
         else:
             print("ERROR: We do not have openxr_loader DLLs for %s" % target_arch)