Eng-13373. Make build-importers.xml fail if libraries are missing. (#5040)
Eng-13373. Make build-importers.xml fail if libraries are missing. (#5040)

ENG-13373.  Use ant zipfileset instead of zipgroupfileset.
zipfileset will	report errors if the src is missing. Now the dist
build will fail if library versions or locations change and the
build-importers.xml is not updated.

VoltDB/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,VoltDB/voltdb