RFR: 7902804: -prof async help messages should mention DYLD_LIBRARY_PATH for Mac OS users

[Aleksey Shipilev]

MacOS needs DYLD_LIBRARY_PATH to be set, not LD_LIBRARY_PATH. Plus, we might want to point out that libPath is available to work-around async-profiler naming issue:
 https://github.com/jvm-profiling-tools/async-profiler/issues/378

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Commit messages:
 - 7902804: -prof async help messages should mention DYLD_LIBRARY_PATH for Mac OS users

Changes: https://git.openjdk.java.net/jmh/pull/11/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmh&pr=11&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902804
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jmh/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/11/head:pull/11

PR: https://git.openjdk.java.net/jmh/pull/11