maven_jar: Reduce visibility of intermediate artifacts

I6168fda0 was trying to provide a workaround for java_doc() rule to
not being able to resolve the location of java_library with exported
dependencies only. The workaround idea was to make intermediate
artifacts visible in maven_jar() definition and use them instead of
java_libraries with exported dependencies only.

Iab67dff9 solved the problem by replacing $(location :foo) macro with
$(classpath :foo) macro. That made the workaround in I6168fda0 not
necessary any more, so that it can be removed.

Change-Id: I7c5322e9f7dafec0359a5bac452285a89e5e8103

lib/maven.defs

@@ -132,7 +132,6 @@ def maven_jar(
       deps = deps + license,
       binary_jar = ':%s__download_bin' % name,
       source_jar = ':%s__download_src' % name if srcjar else None,
-      visibility = visibility,
     )
     java_library(
       name = name,