Remove native compiler dependency in system tests

[llxia]

Native compilation in system tests resulted in many complications when setting up the testing environment.

For example, we need to have the correct compiler installed. xlC is /opt/IBM/xlC/13.1.3/bin (we no longer support it), but it's on the path. xlclang is /opt/IBM/xlC/16.1.0/bin, which isn't on the path. Also, Visual Studio is expected on Windows with specific versions/path.

Talked with @pshipton , and we think we should simplify system tests by removing the native compiler dependency.

ToDo:

• Remove com.test.jlink from system test https://github.com/adoptium/aqa-systemtest/tree/master/openjdk.test.modularity/src/tests/com.test.jlink.
  If this test is important, we can contribute it to OpenJDK if needed.
• Move SharedClassesAPI native code into OpenJ9, and stop building it in the tests.
• Ensure we do not have any other native compilation in system tests (i.e., all build-natives-xxx should be empty)
• Inform infra team to remove native compiler as part of the test env setup requirement. We still need it for non-system tests.

[llxia]

@annaibm could you take a look at this issue? Thanks

[pshipton]

In OpenJDK I see test/jdk/tools/jlink, not sure if we are running these tests.

FYI
/opt/IBM/xlC/16.1.0/bin has both xlC and xlclang. OpenJ9 builds no longer use xlC, or 13.1.3 compilers.
13.1.3 is on the path on some machines, but since AIX 7.3 doesn't support it, I expect 16.1.0 is on the path on AIX 7.3 machines.