test: revert the previous commits to disable ARM64 test again

Currently spiff has no way to ignore the comparison of nan and -nan.

Author: HanatoK

namd/tests/interface/003_reinitatoms/skip_test.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+ARCH=$(arch)
+if [ "$ARCH" = "aarch64" ]; then
+  exit 0
+else
+  exit 1
+fi