Add FREEBSD-Xlist and FREEBSD-upgrade to contrib/libarchive

MFC after:	2 weeks

contrib/libarchive/FREEBSD-Xlist

@@ -0,0 +1,25 @@
+$FreeBSD$
+CMakeLists.txt
+CTestConfig.cmake
+INSTALL
+Makefile.am
+build
+configure.ac
+contrib
+cpio/CMakeLists.txt
+cpio/cpio_windows.c
+cpio/cpio_windows.h
+cpio/test/CMakeLists.txt
+doc
+examples
+libarchive/CMakeLists.txt
+libarchive/archive_windows.c
+libarchive/archive_windows.h
+libarchive/filter_fork_windows.c
+libarchive/test/.cvsignore
+libarchive/test/CMakeLists.txt
+tar/CMakeLists.txt
+tar/bsdtar_windows.c
+tar/bsdtar_windows.h
+tar/test/CMakeLists.txt
+tar/test/test_windows.c

contrib/libarchive/FREEBSD-upgrade

@@ -0,0 +1,24 @@
+$FreeBSD$
+
+libarchive
+
+The source code is pulled with svn:
+
+	svn checkout http://libarchive.googlecode.com/svn/release/2.8
+
+For the contrib directory files and directories were pruned by:
+	
+sh -c 'for F in `cat FREEBSD-Xlist | grep -v FreeBSD`; do rm -rf ./$F ; done'
+
+You may check if there are any new files that we don't need.
+
+The instructions for importing new release and merging to HEAD can be found
+at FreeBSD wiki:
+
+	http://wiki.freebsd.org/SubversionPrimer/VendorImports
+
+To make local changes to xz, simply patch and commit to the trunk
+branch (aka HEAD).  Never make local changes on the vendor branch.
+
+mm@FreeBSD.org
+21-December-2011