Tweak position of $(DLL_DEFFILE) in shared-library link commands.

Reading the GNU ld man page suggests that this is order-sensitive
and should go in front of library references.  Correction to commit
846e91e0.

src/Makefile.shlib

@@ -384,7 +384,7 @@ else
 DLL_DEFFILE = lib$(NAME)dll.def
 
 $(shlib): $(OBJS) $(DLL_DEFFILE) | $(SHLIB_PREREQS)
-	$(CC) $(CFLAGS)  -shared -o $@  $(OBJS) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK) $(LIBS) $(DLL_DEFFILE) -Wl,--out-implib=$(stlib)
+	$(CC) $(CFLAGS)  -shared -o $@  $(OBJS) $(DLL_DEFFILE) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK) $(LIBS) -Wl,--out-implib=$(stlib)
 endif
 
 endif # PORTNAME == cgywin