use zlib-1.2.3

oops; don't back out the minor number, just remove the functions.
this will allow updating to happen seemlessly.

backout the changes made on 29th of january:
- remove gzopenfull() and gzdopenfull()
- un-bump minor number
- remove docs for gone functions.

traditionally this is an invalid change (removing an

backout the changes made on 29th of january:
- remove gzopenfull() and gzdopenfull()
- un-bump minor number
- remove docs for gone functions.

traditionally this is an invalid change (removing an API from a library
without bumping the major.) it has been decided that this case is special
enough not to require that. no one should have been using these new
functions yet.

PS: this may cause "make install" to barf about older libraries already
being installed.

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add two functions to zlib: gzopenfull() and gzdopenfull() that both take
additional "const char *savename" and "u_int32_t mtime" parameters that
are written out into the gzip header in the mtime fiel

add two functions to zlib: gzopenfull() and gzdopenfull() that both take
additional "const char *savename" and "u_int32_t mtime" parameters that
are written out into the gzip header in the mtime field and as the original
filename.

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I've been scolded for not bumping the minor, so there.

increase shlib minor for z_off_t changes.

Add a note to update src/distrib/sets/lists/base/shl.*, and add a missing
RCS Id.

Bump minor version because some function calls were added.

RCSID Police.

make it into a shared library, too.