Add logic to provide md5 checksums on the patch files, placing them in

a file called files/patch-sum.  This has the benefit of only
attempting to patch packages with official patches.  This should mean
that you can untar a pkgsrc.tar.gz over a previous tree, and still
have it do the right thing, ignoring old patch files.

Patches which have an entry in the files/patch-sum file will be
applied, and then any local patches.  If there are local patches to a
package, these should go in patch files called patches/patch-local-*
(these files are ignored when calculating the files/patch-sum file,
and also when checking the patches/patch-* files).

The calculation of the patch checksum ignores any NetBSD RCS Id in the
patch-* files.  This removes a nasty ordering dependency for developers
making patches to packages.

Patch file checksums will only be checked if the files/patch-sum file
exists.

Add a target "makepatchsum", analogous to "makesum", which makes a new
files/patch-sum file.

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