Generate Log4jPlugins class does not compile in JPMS

[ppkarwasz]

Currently log4j-plugin-processor in version 3.0.0-beta3 of Log4j Core adds BND annotations to the generated code.

While these might be useful for OSGi users, they cause a compilation error if the biz.aQute.bnd.annotation module is not present:

• On the compiler classpath,
• A static dependency on the module is not declared in the module-info.java file.

[ppkarwasz]

A workaround for this issue is to add:

<dependency>
  <groupId>biz.aQute.bnd</groupId>
  <artifactId>biz.aQute.bnd.annotation</artifactId>
  <version>7.1.0</version>
  <scope>provided</scope>
</dependency>

to the compile-time only classpath and a:

requires static biz.aQute.bnd.annotation;

to the module descriptor. The annotations have a CLASS retention, so they don't cause problems at runtime.