[jdk25u-dev] RFR: 8372710: Update ProcessBuilder/Basic regex

[Roland Mesde]

Backporting JDK-8372710: Update ProcessBuilder/Basic regex.

This PR uodates the ProcessBuilder/Basic test regex to match new IOException format changed in JDK-8352533 (from error=%d to error: %d), fixing failures on AIX.

Ran related tests on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

make test TEST=test/jdk/java/lang/ProcessBuilder/Basic.java

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Commit messages:
 - Backport b3e063c2c34ac12ae2a566617560ecc52253262d

Changes: https://git.openjdk.org/jdk25u-dev/pull/289/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=289&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372710
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/289.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/289/head:pull/289

PR: https://git.openjdk.org/jdk25u-dev/pull/289