RFR: 8356819: [macos] MacSign should use "openssl" and "faketime" from Homebrew by default

[Alexander Matveev]

`openssl` from macOS will ignore `faketime` and as result expired certificates will not be generated correctly. By default we should use these tools from Homebrew.

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Commit messages:
 - 8356819: [macos] MacSign should use "openssl" and "faketime" from Homebrew by default

Changes: https://git.openjdk.org/jdk/pull/25196/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25196&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356819
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25196.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25196/head:pull/25196

PR: https://git.openjdk.org/jdk/pull/25196