RFE: Move directory macros to separate macro file not needing a JRE

[jerboaa]

There has been a recent split of javapackages-tools into two packages for directory ownership. However, there are some RPM macros in /usr/lib/rpm/macros.d/macros.jpackage which solely relate to paths to directories. One such example is this:

%_jvmdir        %{_prefix}/lib/jvm

It would make more sense to move those directory-macros into its own file, macros.jpackage-filesystem say, and then javapackages-tools may require javapackages-filesystem for these macros for backward compat.