Add diffstat and quilt contributed by mjw.

Only basic compilation and packaging has been tested.

dev-util/diffstat/diffstat-1.51.bep

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+DESCRIPTION="Display a histogram of diff changes"
+HOMEPAGE="http://invisible-island.net/diffstat/diffstat.html"
+SRC_URI="ftp://invisible-island.net/diffstat/diffstat-1.51.tgz"
+CHECKSUM_MD5="a7d3fd1ba2a9a6c9e2b32e867b5e8792"
+REVISION="1"
+STATUS_HAIKU="stable"
+DEPEND=""
+BUILD {
+	cd diffstat-1.51
+	./configure --prefix=/boot/common
+	make
+}
+
+INSTALL {
+	cd diffstat-1.51
+	make install DESTDIR="${DESTDIR}"
+}
+

dev-util/diffstat/diffstat.OptionalPackageDescription

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+Package:	diffstat
+Version:	1.51
+Copyright:	1994-2009  Thomas E. Dickey
+License:	Diffstat
+URL:		http://invisible-island.net/diffstat

dev-util/diffstat/licenses/Diffstat

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+
+Copyright 1994-2008,2009 by Thomas E. Dickey
+All Rights Reserved.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided
+that the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation, and that the name of the above listed copyright holder(s)
+not be used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD
+TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+