RFR: JDK-8317799 : AIX PPC64: FFI symbol lookup doesn't find symbols [v7]

[suchismith1993]

> The math library in AIX specifically, is a static archive. Doing a -lm wont suffice, because when the symbols are looked up using dlsym or accessing native code through Java, it will lead to failures.
> Hence we had to come up with a list of symbols to allow math library symbols to be accesible.
> Also, there are parts of libc library that are static too, and hence those symbols also are present in this list.
> Without this change, the StdLibTest and multiple other tests which make native function calls using FFI, fail with NoSuchElementException.
> 
> 
> 1. Adding required compiler flags.
> 2. Adding required symbols.
> 
> 
> JBS-ISSUE : [JDK-8317799](https://bugs.openjdk.org/browse/JDK-8317799)

suchismith1993 has updated the pull request incrementally with two additional commits since the last revision:

 - Fix Typos
 - Remove unnecessary includes

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16414/files
  - new: https://git.openjdk.org/jdk/pull/16414/files/48a69c59..efbb245a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16414&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16414&range=05-06

  Stats: 6 lines in 1 file changed: 1 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16414.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16414/head:pull/16414

PR: https://git.openjdk.org/jdk/pull/16414