java: complain if java_JAVA is used but $(javadir) is undefined Fixes automake bug#8461. * automake.in (handle_java): Remove inappropriate "java" argument from the calls to `&am_install_var' and `&am_primary_prefixes'. * tests/instdir-java.test (Makefile.am): Define `$(javadir)'. * tests/javadir-undefined.test: New test. * tests/Makefile.am (TESTS): Add it. * NEWS: Update.