Code review comment for lp:~davidagraf/zorba/data-formatting-module-bug-989490

It is necessary for now, primarily to support building the data-formatting-module against an *installed* Zorba with the util-jvm module. In that case, util-jvm's CMakeLists.txt won't be run, so FIND_PACKAGE(Java) and (JNI) won't be run either.

A better solution would probably be to add those two FIND_PACKAGE() calls, with the associated JAVA_HOME trickery, to util-jvm's use file (util-jvm-module/config/UtilJavaUse.cmake), and then have data-formatting and schema-tools include the use file in the same way that the EXI module does. (Ideally util-jvm's own CMakeLists.txt would also include its own use file so that the code would exist in exactly one place, but I'm not totally sure how to accomplish that.)