RFR: JDK-8309591: Socket.setOption(TCP_QUICKACK) uses wrong level

[Vyom Tewari]

Please review the simple fix for the issue [JDK-8309591](https://bugs.openjdk.org/browse/JDK-8309591). In this issue sys call is incorrectly setting the socket option(TCP_QUICKACK) at wrong level(SOL_TCP).  After fix all the existing tests are passing.

Note: I did the similar changes for AIX port as well but I don’t have AIX to test it locally.

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

Commit messages:
 - JDK-8309591: Socket.setOption(TCP_QUICKACK) uses wrong level

Changes: https://git.openjdk.org/jdk/pull/14671/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14671&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309591
  Stats: 7 lines in 2 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/14671.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14671/head:pull/14671

PR: https://git.openjdk.org/jdk/pull/14671