Remove Java support (both in terms of the JAVA option and everything
associated with it as well as java from CATEGORIES) from this port.

Technically GCC 4.8 only went end-of-life upstream in June 2015, alas
GCC 4.9 and GCC 5 are well established by now and also provide support
for Java (GCJ/libgcj), and this change simplifies this port significantly
and speeds up the build.

In addition to the expected changes to Makefile, pkg-plist, and pkg-descr,
this also removes files/java-patch-hier.