fix typo in makefile

Makefile

@@ -668,7 +668,7 @@ COMPOSITEDATAREADER_SRC =\
 
 COMPOSITEDATAREADER_OBJ := $(patsubst %.cpp, $(OBJDIR)/%.o, $(COMPOSITEDATAREADER_SRC))
 
-COMPOSITEDATAREADER:=$(LIBDIR)/Cntk.CompositeData-$(CNTK_COMPONENT_VERSION).so
+COMPOSITEDATAREADER:=$(LIBDIR)/Cntk.Composite-$(CNTK_COMPONENT_VERSION).so
 ALL_LIBS+=$(COMPOSITEDATAREADER)
 PYTHON_LIBS+=$(COMPOSITEDATAREADER)
 SRC+=$(COMPOSITEDATAREADER_SRC)