RFR: 8262501: jdk17 libjvm link failure with --as-needed and clock_gettime in librt

[David Holmes]

The fix for JDK-8246112 put the -lrt link flag in the wrong place, causing it to appear too early in the linker command-line. This changes puts it in the right place.

Contributed by: Matthias Klose  (~doko)

Testing: 
   - local testing by Matthias
   - tiers 1-3
   - GHA builds

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

Commit messages:
 - Fixed whitespace
 - 8262501: jdk17 libjvm link failure with --as-needed and clock_gettime in librt

Changes: https://git.openjdk.java.net/jdk/pull/3503/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3503&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262501
  Stats: 17 lines in 2 files changed: 9 ins; 7 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3503.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3503/head:pull/3503

PR: https://git.openjdk.java.net/jdk/pull/3503