RFR: 8354802: MAX_SECS definition is unused in os_linux

[Matthias Baesken]

Seems the MAX_SECS definition in os_linux.cpp is not needed any more, related code was moved or deleted.

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Commit messages:
 - JDK-8354802

Changes: https://git.openjdk.org/jdk/pull/24686/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24686&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354802
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24686.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24686/head:pull/24686

PR: https://git.openjdk.org/jdk/pull/24686