Fix HGCal build file

module.cc is not currently included in GeometryHGCalCommonDataPlugin, so a lot of plugins are compiled but not declared as EDM plugins.  In the current Integration Builds tests 122xx, 124xx and 126xx fail with:

    ----- Begin Fatal Exception 27-Mar-2014 15:20:02 CET-----------------------
    An exception of category 'PluginNotFound' occurred while
       [0] Processing run: 1
       [1] Running path 'simulation_step'
       [2] Calling beginRun for module OscarProducer/'g4SimHits'
       [3] Using EventSetup component XMLIdealGeometryESSource/'' to make data DDCompactView/'' in record IdealGeometryRecord
    Exception Message:
    Unable to find plugin 'hgcal:DDHGCalEEAlgo' in category 'DDAlgorithm'. Please check spelling of name.
    ----- End Fatal Exception -------------------------------------------------

This pull request should fix them.  They still fail in step 2 though.