Fix nxfonts clean

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1418 42af7a65-404d-4744-a932-0658087f49c3

graphics/Makefile

@@ -136,11 +136,13 @@ depend: .depend
 
 clean:
 	@make -C nxglib -f Makefile.sources clean TOPDIR=$(TOPDIR)
+	@make -C nxfonts -f Makefile.sources clean TOPDIR=$(TOPDIR)
 	@rm -f $(BIN) *~ .*.swp
 	$(call CLEAN)
 
 distclean: clean
 	@make -C nxglib -f Makefile.sources distclean TOPDIR=$(TOPDIR)
+	@make -C nxfonts -f Makefile.sources distclean TOPDIR=$(TOPDIR)
 	@rm -f Make.dep .depend
 
 -include Make.dep