[crac] RFR: macOS build fixes [v2]

[Roman Marchenko]

> This changeset fixes build warnings and errors occured on macOS.

Roman Marchenko has updated the pull request incrementally with one additional commit since the last revision:

  Fixing review comments

-------------

Changes:
  - all: https://git.openjdk.org/crac/pull/92/files
  - new: https://git.openjdk.org/crac/pull/92/files/cc7a07d4..e15aaf59

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=92&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=92&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/92.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/92/head:pull/92

PR: https://git.openjdk.org/crac/pull/92