avoid defining gb_TAILBUILDMODULES, use the command only when necessary
avoid defining gb_TAILBUILDMODULES, use the command only when necessary

This enables to properly use make <module>.all for builds without
dictionaries and hopefully also solves the problem behind
5133d3c48fd6d2a795e42b87a1e7b464946606a3

Change-Id: I43872864aa135014ea51d15b34ef4de151f14c3d

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core