Document zlib update procedure and provide future maintainers a

snapshot of the current state of the import.

MFC after:	2 weeks

lib/libz/FREEBSD-upgrade

@@ -0,0 +1,44 @@
+$FreeBSD$
+
+ZLib 1.2.2
+
+Original distribution from http://www.gzip.org/zlib/
+
+Vendor files removed from distribution before import:
+	 INDEX		 configure	 qnx/
+	 Makefile	 contrib/	 win32/
+	 Makefile.in	 msdos/		 zconf.in.h
+	 amiga/		 old/
+	 as400/		 projects/
+
+Vendor files imported:
+	 ChangeLog	 example.c	 minigzip.c
+	 FAQ		 gzio.c		 trees.c
+	 README		 infback.c	 trees.h
+	 adler32.c	 inffast.c	 uncompr.c
+	 algorithm.txt	 inffast.h	 zconf.h
+	 compress.c	 inffixed.h	 zlib.3
+	 crc32.c	 inflate.c	 zlib.h
+	 crc32.h	 inflate.h	 zutil.c
+	 deflate.c	 inftrees.c	 zutil.h
+	 deflate.h	 inftrees.h
+
+As of April, 2005, only the following three vendor files
+had non-trivial local changes:
+	 gzio.c   minigzip.c  zconf.h
+
+Added files (not from vendor):
+	 Makefile	 zopen.c	 FREEBSD-upgrade
+
+To Update:
+  1) Unpack vendor sources into a clean directory.
+  2) Delete unnecessary files.
+  3) Import onto the vendor branch.  The 1.2.2 import was done like this:
+   cvs -d <CVSROOT> import -ko -m "ZLib 1.2.2" src/lib/libz ZLIB v1_2_2
+  4) In a clean directory, check out a fresh copy of HEAD,
+	 merging in vendor changes since the last import.
+   cvs -d <CVSROOT> co -jZLIB:yesterday -jZLIB src/lib/libz
+  5) Resolve any conflicts and commit them.
+  6) Update this file with any changes to the file list or update procedure.
+
+kientzle@FreeBSD.org