remove -Wshadow due to not clean gfal headers.

git-svn-id: http://root.cern.ch/svn/root/trunk@34186 27541ba8-7e3a-0410-8455-c3a389f83636

io/gfal/Module.mk

@@ -67,4 +67,5 @@ distclean-$(MODNAME): clean-$(MODNAME)
 distclean::     distclean-$(MODNAME)
 
 ##### extra rules ######
+$(GFALO) $(GFALDO): CXXFLAGS := $(filter-out -Wshadow,$(CXXFLAGS))
 $(GFALO): CXXFLAGS += $(GFALINCDIR:%=-I%)