Allow running with --illegal-access=deny

[Thihup]

Describe the bug
As of JDK 15, the default value for illegal-access is permit, however there is a proposal to change to deny in JDK 16 and deprecate the --illegal-access parameter. We can already simulate the by compiling with --illegal-access=deny.

To Reproduce

/jvms/jdk-15/bin/javac -J--illegal-access=deny -cp ~/.m2/repository/org/projectlombok/lombok/1.18.16/lombok-1.18.16.jar /tmp/EmptyClass.java

An annotation processor threw an uncaught exception.
Consult the following stack trace for details.
java.lang.IllegalAccessError: class lombok.javac.apt.LombokProcessor (in unnamed module @0xa74868d) cannot access class com.sun.tools.javac.processing.JavacProcessingEnvironment (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.processing to unnamed module @0xa74868d
        at lombok.javac.apt.LombokProcessor.getJavacProcessingEnvironment(LombokProcessor.java:433)
        at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:92)
        at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:160)
        at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:213)
        at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.init(AnnotationProcessor.java:64)
        at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:702)
        at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:829)
        at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:925)
        at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1269)
        at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1383)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1261)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:935)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:59)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:45)

Expected behavior
I hope that would be possible to work as illegal-access=permit however I'm aware that maybe not possible.

Version info (please complete the following information):

• Lombok version: 1.18.6

[rspilker]

It should be possible by adding a bunch of --ADD-OPENS (or something like that) parameters to the javac invocation. And that's the way the people at Oracle seem to want.

[rspilker]

You can find an example in

https://github.com/rzwitserloot/lombok/blob/8cfe4c73fab797db2fa5a73402b458a91d5af2ba/docker/maven/files/jdk-13/classpath/pom.xml#L25-L37

[Thihup]

Duplicate of #2681