Import Debian version 0.60

java-common (0.60) unstable; urgency=medium

  * Don't build jre/jdk defaults packages on platforms still relying
    on java 5 (provided by gcj). Closes: #892529.
  * Remove kfreebsd-amd64 kfreebsd-i386 from java9_architectures.
  * Prepare the default values for Java 11
  * Stop building gcj-native-helper.
  * java_defaults.mk: Add two new macros:
    - java_default_architectures
    - java_dependency, call as $(call java_dependency, default-jdk)
      -> default-jdk [!hppa !ia64 !s390 !sparc !hurd-i386]