[foreign-memaccess+abi] RFR: Do not run a lengthy test on zero machines

[Per Minborg]

This PR suggest not running a lengthy test on zero machines

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Commit messages:
 - Require not zero

Changes: https://git.openjdk.org/panama-foreign/pull/910/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=910&range=00
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/910.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/910/head:pull/910

PR: https://git.openjdk.org/panama-foreign/pull/910