[MCOMPILER-422] multi release jar issue exporting release version only packages

**[John Patrick](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=nhoj.patrick)** opened **[MCOMPILER-422](https://issues.apache.org/jira/browse/MCOMPILER-422?redirect=false)** and commented

I'm having to add ModuleInfoHack.java in empty packages so that compiler works, then do excludes **/ModuleInfoHack.java at package time.

The simplest example is;

```
src/main/java/package/a/Example1.java (1)
src/main/java/package/b/Example2.java (2)
src/main/java11/package/b/Example2.java (3)
src/main/java11/module-info.java (4)
```

With module-info.java looking like;

```
module MODULE_A {
exports package.a;
exports package.b;
}
```

I get compile errors so I need to create this structure adding (5);

```
src/main/java/package/a/Example1.java (1)
src/main/java/package/b/Example2.java (2)
src/main/java11/package/a/ModuleInfoHack.java (5)
src/main/java11/package/b/Example2.java (3)
src/main/java11/module-info.java (4)
```

The maven compiler plugin has this configuration;

```

java11-main
compile

compile


11

11


${project.basedir}/src/main/java11

true

```

Similar to MCOMPILER-412 it would be useful and fix my issues if target/classes is added to the compiler when doing this compiler execution.

---

**Affects:** 3.8.1