Port summary of busybox patches from 1.7.4 to 1.18.1

patches/busybox/1.18.1/README

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+1.18.1-mdadm.diff:
+This adds a minimal mdadm implementation to busybox for scanning for and
+activating mdraid arrays. You can blame robbat2 for this one :)
+Patch ported from 1.7.4 to 1.18.1 by Denis Kaganovich.
+
+1.18.1-mdstart.diff:
+This adds a 'mdstart' command to busybox, which is used for the activation of
+individual mdraid arrays. It originated with 1.1.3+gentoo or earlier.
+Patch ported from 1.7.4 to 1.18.1 by Denis Kaganovich.
+
+1.18.1-openvt.diff:
+It is unknown what problem this patch fixes. It may no longer be needed.
+Patch ported from 1.7.4 to 1.18.1 by Denis Kaganovich.
+
+busybox-1.7.4-signal-hack.patch:
+It is unknown what this patch does. It may no longer be needed.