Fix linking of fio executable

First of all make sure that $(LDFLAGS) are used during linking so that the
user can set the linker's flags.

Then also make sure that libraries are listed after the objects, so that
GNU ld's --as-needed option will not cause fio linking to fail.

Cc: Robin H. Johnson <robbat2@gentoo.org>

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/Makefile b/Makefile
index 07e011e..1d81562 100644
--- a/Makefile
+++ b/Makefile
@@ -70,9 +70,9 @@
 
 .c.o:
 	$(QUIET_CC)$(CC) -o $@ -c $(CFLAGS) $(CPPFLAGS) $<
-	
+
 fio: $(OBJS)
-	$(QUIET_CC)$(CC) $(CFLAGS) -o $@ $(LIBS) $(OBJS)
+	$(QUIET_CC)$(CC) $(LDFLAGS) $(CFLAGS) -o $@ $(OBJS) $(LIBS)
 
 depend:
 	$(QUIET_DEP)$(CC) -MM $(CFLAGS) $(CPPFLAGS) $(SOURCE) 1> .depend