build-test-lib target seems broken

[Eirik Bjørsnøs]

Hi,

The 'build-test-lib' target seems to be broken:

- make/test/BuildTestLib.gmk references the
directory $(TEST_LIB_SOURCE_DIR)/sun which does not seem to exist. This can
be fixed by removing the reference.
- Some test-lib sources use preview-features which is not enabled by
make/test/BuildTestLib.gmk. This is fixed by adding a JAVAC_FLAGS with
--enable-preview and also adding 'preview' to DISABLED_WARNINGS
- ASN1Formatter.annotate has a possible lossy conversion from long to int
which can be fixed by adding an explicit cast

Let me know if this is worth fixing and I can create a PR from this branch
of fixes:

https://github.com/openjdk/jdk/compare/master...eirbjo:build-test-libs

Thanks,
Eirik.
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