[11u]: RFR: 8238225: Issues reported after replacing symlink at Contents/MacOS/libjli.dylib with binary

[Langer, Christoph]

Hi,

the fix for "8235687: Contents/MacOS/libjli.dylib cannot be a symlink" [0], which had been backported to 11.0.6, has introduced an issue for custom launchers that try to start a JVM from a MacOS bundle. This has been fixed and we should take this fix back to 11u as well.

Please help to review:
Bug: https://bugs.openjdk.java.net/browse/JDK-8238225
Original Patch: https://hg.openjdk.java.net/jdk/jdk/rev/023df178388e
Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8238225.11u/

The actual fix in src/java.base/macosx/native/libjli/java_md_macosx.c is quite straightforward, except that the file was renamed to src/java.base/macosx/native/libjli/java_md_macosx.m in head revision which caused the need for a little reshuffling. However, I also wanted to take the test along which didn't exist yet in jdk11u, so I had to borrow parts from JDK-8213362 [1], which introduced the test and subsequent changes JDK-8215000 [2] and JDK-8216265 [3]. These  changes however don't qualify for a full backport, so I decided for carveouts. I also had to account for the fact that in 11u libjli is located in subfolder lib/jli for non-windows platforms, so I made a few additional modifications in make/test/JtregNativeJdk.gmk and test/jdk/tools/launcher/JliLaunchTest.java.

Thanks
Christoph

[0] https://bugs.openjdk.java.net/browse/JDK-8235687
[1] https://bugs.openjdk.java.net/browse/JDK-8213362
[2] https://bugs.openjdk.java.net/browse/JDK-8215000
[3] https://bugs.openjdk.java.net/browse/JDK-8216265