Changeset 349 for branches/contrib/openwrt/patches/all/in.011_disable_all_openwrt_packages

Rework the openwrt/patch target. Instead of patching with a hand-rolled
list of patches, scan the appropriate directories for patch files. Patch
filenames now MUST match the pattern [0-9]+(-[0-9]*:[0-9]*)_<name>. The
lead digits specify order of application, lower numbers are applied
first. If present, the two subsequent numbers indicate a range of
Subversion revisions that a given patch applies to. If a number is
absent, the range is interpreted to include all older revisions or all
newer revisions as appropriate.

Adjust openwrt/unpatch target to match (patches are now removed in
reverse order). Adjust the generate script to match.