RFR: 8349752: Tier1 build failure caused by JDK-8349178

[Jiangli Zhou]

Add `BUILD_HOTSPOT_JTREG_LIBRARIES_LIBS_libatExit += -ldl` for linux target.

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Commit messages:
 - Fix lib name.
 - Add `BUILD_HOTSPOT_JTREG_LIBRARIES_JDK_LIBS_libatExit := -ldl` for linux target.

Changes: https://git.openjdk.org/jdk/pull/23544/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23544&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349752
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23544.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23544/head:pull/23544

PR: https://git.openjdk.org/jdk/pull/23544