Manual cleanup of cmake code for ndbcluster:

CMake Warning (dev) at storage/ndb/ndb_configure.cmake:310 (SET):
  implicitly converting 'INTEGER' to 'STRING' type.

Check all usage of MYSQL_ADD_EXECUTABLE() and ADD_CONVENIENCE_LIBRARY()/
Use macro options for these utilities, rather than separate calls to
TARGET_LINK_LIBRARIES()

Cosmetics, indentation, sorting of lists etc. in files touched by the above.

Set interface multiplicity on the 'ndbgeneral' library, so that linking
of executables are not dependent on the order of libraries linked.

Limit memory used by javac. Pushbuild showed several of these in parallel:
pb2user  54281  0.3  0.0 40029084 71080 pts/1  Sl   13:15   0:06 /usr/local/java/jdk1.8-64/bin/javac
and the build failed.

Remove a simple FILE(GLOB ...) which had only one result.
With globbing cmake cannot track dependencies, and dependent targets
are not rebuilt when source input changes.

TODO: remove all the other globbing in use to find .java sources.

Change-Id: I6ea4a8c8c094ab629b904d1fb44002827641f6b9