Ansible request for AIX: Correct libc++ runtime environment.

- Historically, the builds requiring xlc16 (e.g., openj9) have also added two OSS packages: `libgcc` and `libgcc8`.
- These were needed because the (beta/GA) release of xlc16 - did not have the rte library package `libc++.rte`.
- This library is provided by IBM, both in the xlC16 package, as in a separate 'runt-time-only' package.
- As, such, NOT using the IBM provided library (in particular `libatomic.a`) may introduce unexpected issues.

- [x] Missing install
- [x] Bug in ansible playbook
- [ ] Request for new playbook addition

Details:

Current:
```
p159a01:/ # rpm -qa | grep gcc
libgcc-8-1.ppc
libgcc8-8.3.0-4.ppc
p159a01:/ # rpm -ql libgcc
/opt/freeware/lib/libatomic.a
/opt/freeware/lib/libgcc_s.a
/opt/freeware/lib/pthread/libatomic.a
/opt/freeware/lib/pthread/libgcc_s.a
/opt/freeware/lib/pthread/ppc64/libatomic.a
/opt/freeware/lib/pthread/ppc64/libgcc_s.a
/opt/freeware/lib64/libatomic.a
/opt/freeware/lib64/libgcc_s.a
p159a01:/ # rpm -ql libgcc8
/opt/freeware/doc/libgcc8-8.3.0
/opt/freeware/doc/libgcc8-8.3.0/COPYING
/opt/freeware/doc/libgcc8-8.3.0/COPYING.LIB
/opt/freeware/doc/libgcc8-8.3.0/COPYING3
/opt/freeware/doc/libgcc8-8.3.0/COPYING3.LIB
/opt/freeware/lib/gcc
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/libatomic.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/libgcc_s.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/ppc64
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/ppc64/libatomic.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/ppc64/libgcc_s.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread/libatomic.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread/libgcc_s.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread/ppc64
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread/ppc64/libatomic.a
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread/ppc64/libgcc_s.a
```
Desired:
```
jenkins@adopt08:[/home/jenkins/bin]lslpp -f libc++.rte
Fileset File
----------------------------------------------------------------------------
Path: /usr/lib/objrepos
libc++.rte 16.1.0.2 /usr/lpp/xlC/lib/aix61/libatomic.a
/usr/lpp/xlC
/usr/lib/libatomic.a -> /usr/lpp/xlC/lib/libatomic.a
/usr/lib/libc++.a -> /usr/lpp/xlC/lib/libc++.a
/usr/lpp/xlC/lib
/usr/lpp/xlC/lib/aix61/libc++.a
/usr/lpp/xlC/lib/aix61
```

Locate the Ansible playbook responsible for provisioning builds requiring xlc16 on AIX and inspect how libgcc and libgcc8 are installed. Compare that package setup with the requested libc++.rte fileset and verify the resulting runtime environment on an AIX host; done means the IBM-provided runtime is used instead of the conflicting OSS libraries.

Written by the indexing model from the issue text.