Add upgrade instructions and helper file.

contrib/texinfo/FREEBSD-Xlist

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+*ABOUT-NLS
+*Makefile.am
+*Makefile.in
+*acconfig.h
+*acinclude.m4
+*aclocal.m4
+*config.guess
+*config.sub
+*configure
+*configure.in
+*dir-example
+*djgpp
+*doc/*.tex
+*doc/macro.texi
+*doc/mdate-sh
+*doc/stamp-vti*
+*doc/texi2dvi.1
+*doc/userdoc.texi
+*info/makedoc.c
+*info/pcterm.c
+*install-sh
+*lib/alloca.c
+*lib/memcpy.c
+*lib/memmove.c
+*lib/strcasecmp.c
+*lib/strdup.c
+*lib/strerror.c
+*lib/strncasecmp.c
+*makeinfo/tests
+*missing
+*mkinstalldirs
+*po
+*stamp-h.in
+*util/*awk
+*util/deref.c
+*util/fix*
+*util/gen-dir-node
+*util/tex3patch
+*util/texi-docstring-magic.el
+*util/texi2dvi

contrib/texinfo/FREEBSD-upgrade

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+# ex:ts=8
+$FreeBSD$
+
+GNU Texinfo 4.0
+	originals can be found at: ftp://ftp.gnu.org/gnu/texinfo/
+
+
+For the import of Texinfo many files and directories were pruned by:
+
+	tar -X FREEBSD-Xlist -xzf texinfo-4.0.tar.gz
+
+
+To reduce the size of import, and to make it so the changes from 3.12
+to 4.0 are easy to determine, the 4.0 directory structure was munged
+before import:
+
+	cd texinfo-4.0
+	mv config.in config.h.in
+	mv intl/libgettext.h lib/libintl.h
+	rm -rf intl
+
+
+Then imported by:
+
+	cvs import -m 'Virgin import of GNU texinfo 4.0' \
+		src/contrib/texinfo FSF v4_0
+
+After the import, a separate extraction of texinfo was GNU configured
+in the "normal" way.  The resulting config.h file should be compared
+with src/contrib/texinfo/config.h, and src/contrib/texinfo/config.h
+updated as needed.
+
+To make local changes to texinfo, simply patch and commit to the main
+branch (aka HEAD).  Never make local changes on the vendor (FSF) branch.
+
+All local changes should be submitted to the FSF for inclusion in the
+next vendor release.
+
+ru@FreeBSD.org
+17-Jan-2000