[foreign-memaccess+abi] RFR: Fix test with strcat [v2]

[Per Minborg]

> Fix test with strcat

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Update test/jdk/java/foreign/TestStringEncoding.java
  
  Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>

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Changes:
  - all: https://git.openjdk.org/panama-foreign/pull/860/files
  - new: https://git.openjdk.org/panama-foreign/pull/860/files/d426f8e9..bb510fc3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-foreign&pr=860&range=01
 - incr: https://webrevs.openjdk.org/?repo=panama-foreign&pr=860&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/860.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/860/head:pull/860

PR: https://git.openjdk.org/panama-foreign/pull/860