[package] opkg:

- replace package list parser by something that works with fixed buffers
	  to avoid slurping the whole file into memory during parsing
	- fix a possible null pointer dereference in opkg_remove_cmd()
	- get rid of upgrade, it cannot upgrade single packages and kills
	  the system in most cases
	- get rid of the flag operation, not needed
	- bump package revision


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18119 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/opkg/patches/011-fix_nullpointer_deref.patch

@@ -0,0 +1,11 @@
+--- a/libopkg/opkg_cmd.c
++++ b/libopkg/opkg_cmd.c
+@@ -878,7 +878,7 @@
+ 	            pkg_to_remove = pkg_hash_fetch_installed_by_name(&conf->pkg_hash, pkg->name );
+                }
+         
+-               if (pkg == NULL) {
++               if (pkg_to_remove == NULL) {
+ 	            opkg_message(conf, OPKG_ERROR, "Package %s is not installed.\n", pkg->name);
+ 	            continue;
+                }