[PATCH] Add option to use external zlib (without awt/splashscreen changes)

Hi, as I've just mailed to awt-dev a reduced copy of my previous external-zlib patch that only changes splashscreen support (as it's needed for external jpeg/giflib/libpng), I'm sending back a new copy of external-zlib that excludes that particular part. -- Diego "Flameeyes" Pettenò http://farragut.flameeyes.is-a-geek.org/