RFR: JDK-8334217 : [AIX] Misleading error messages after JDK-8320005 [v4]

[Suchismith Roy]

> dll_load_library() call fails is not analyzed (the ebuf content is ignored)
> dll_load_library does not analyze the contents of ebuf which leads to misleading error message when library loading fails.
> 
> We now call  the second dll_load_library() only if the first returns with a 'No such file or directory' error message.
> If the first dll_load_library() found the library is not able to load it by any reason, we do not try again with a .a extension.
> [JDK-8334217](https://bugs.openjdk.org/browse/JDK-8334217)

Suchismith Roy has updated the pull request incrementally with one additional commit since the last revision:

  check error_number

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19887/files
  - new: https://git.openjdk.org/jdk/pull/19887/files/ebc1ceff..80e3f8f3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19887&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19887&range=02-03

  Stats: 10 lines in 2 files changed: 4 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/19887.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19887/head:pull/19887

PR: https://git.openjdk.org/jdk/pull/19887