RFR: 8347143: [aix] Fix strdup use in os::dll_load [v4]

[Joachim Kern]

> The use of strdup (which is os::strdup because of context) in aix's os::dll_load is odd. The result is nearly unused (it's passed to strrchr, but the original filename could be used instead), so the duplication doesn't seem needed. And the duplicate is free'd using FREE_C_HEAP_ARRAY, which seems wrong.

Joachim Kern has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Merge master
 - Cosmetic changes
 - Copyright dates
 - JDK-8347143

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Changes: https://git.openjdk.org/jdk/pull/23078/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23078&range=03
  Stats: 17 lines in 1 file changed: 7 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/23078.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23078/head:pull/23078

PR: https://git.openjdk.org/jdk/pull/23078