jpackage issue with --dest

[Maurizio Cimadamore]

Hi,
I'm relatively new to jpackage and I found a weird issue on linux where 
the name of a --dest folder can affect the correct behavior of the 
generated application image.

I have put together an hello world application, with a jarfile. If I 
jpackage it with the following command line:

```
$ jpackage --type app-image --name HelloWorld --input 
out/artifacts/jpackage_test_jar --main-jar jpackage-test.jar --dest output
```

Everything works correctly, and launching the generated app prints 
"Hello world":

```
$ output/HelloWorld/bin/HelloWorld
Hello world!
```

However, if the destination directory contains "bin" (even as a nested 
subfolder), there are issues. Here's the jextract command line:

```
$ jpackage --type app-image --name HelloWorld --input 
out/artifacts/jpackage_test_jar --main-jar jpackage-test.jar --dest bin
```

(the only thihng that changed is the --dest parameter)

And here's what I get:

```
$ bin/HelloWorld/bin/HelloWorld
Error: could not find libjava.so
Error: Could not find Java SE Runtime Environment.
```

I use Ubuntu 20.04. A colleague of mine using MacOS does not seem to 
have the same issue, so it seems to be system specific.

I'm using the latest jpackage from jdk/jdk.

Is this a known issue?

Cheers
Maurizio