COMP: place libz linkage at the end (#1238)

src/OpenFOAM/Make/options

@@ -5,11 +5,13 @@ EXE_INC = \
     -I$(OBJECTS_DIR)
 
 LIB_LIBS = \
-    $(FOAM_LIBBIN)/libOSspecific.o \
-    -lz
+    $(FOAM_LIBBIN)/libOSspecific.o
 
 ifeq ($(FOAM_LINK_DUMMY_PSTREAM),libo)
     LIB_LIBS += $(FOAM_LIBBIN)/dummy/libPstream.o
 else
     LIB_LIBS += -L$(FOAM_LIBBIN)/dummy -lPstream
 endif
+
+LIB_LIBS += \
+    -lz