### Description
Enabling python binding and gcc support for AIX.
### Motivation and Context
Code changes in this PR contains:
1. python binding enablement
2. gcc building support
Below are list of files and the description.
1. cmake/CMakeLists.txt
[gcc building support] -no-unused-function compiler flag addition for
IBMClang
2. cmake/external/eigen.cmake
[gcc building support] AIX check for applying the AIX patch
3. cmake/onnxruntime_python.cmake
[python binding ] putting NOT AIX check for -Xlinker
4. cmake/onnxruntime_unittests.cmake
[gcc building support] Fix for gtest behavior. Check the comment .
[python binding ] using -Wl,-brtl for linking
onnxruntime_providers_shared in test_execution_provider
5. cmake/patches/eigen/eigen-aix.patch
[gcc building support] In AIX gcc, we are hitting
__builtin_cpu_supports("mma") which is not supported yet. So patching
code for this method . Patched code will check for P10 Processor at
run-time and based on that routine will be set.
6. onnxruntime/python/onnxruntime_validation.py
[python binding ] Adding AIX check in check_distro_info()
7. onnxruntime/test/providers/cpu/generator/random_test.cc
[gcc building support] updating previous check for AIX , along with
clang. So in case of gcc, else block will hit.
8. onnxruntime/test/python/onnxruntime_test_python.py
[python binding ] powerpc check on platform.processor()
9. setup.py
[python binding ] Adding AIX check for list of libs.
### Description
<!-- Describe your changes. -->
Add 32-bit patch binary and infra to fallback to it. The Azure devops
Windows CIs are missing patch.exe from their git install for some reason
so the default `find_package(Patch)` fails as that is where it expects
to find it.
Remove Eigen patch. Underlying issue was fixed in source 3 years ago by
c6c84ed961
and the patch command is invalid (args are for git apply not patch).
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Make usage of patch consistent across all CIs
Fix https://github.com/microsoft/onnxruntime/issues/15248
* Guard unused parameter
Guard unused parameter for Linux Arm and other cases.
* Add ACL (Arm Compute Library) execution provider
Add a new execution provider targeting Arm architecture based on Arm Compute Library.
Validated on NXP i.MX8QM CPU with ResNet50, MobileNetv2 and VGG models.
All unit tests are passing.
Comparative performance improvements for ResNet50v1 model obtained with
onnxruntime_perf_test:
A72 2xA72 A53 4xA53
ACL vs CPU 16% 9% 21% 13%
Usage documentation available in ACL-ExecutionProvider.
* Fix eigen unused parameter
Fix eigen unused parameter error for Arm cross-compilation.
