Fixing plugin Makefile, suggestion from @df7cb
Fixing plugin Makefile, suggestion from @df7cb

rafaelthca/OmniDB,OmniDB/OmniDB,OmniDB/OmniDB,rafaelthca/OmniDB,OmniDB/OmniDB,OmniDB/OmniDB,rafaelthca/OmniDB,OmniDB/OmniDB,rafaelthca/OmniDB,rafaelthca/OmniDB,OmniDB/OmniDB,rafaelthca/OmniDB,OmniDB/OmniDB,rafaelthca/OmniDB