[PATCH] Allow usage of external zlib copy

[Phil Race]

PS .. if these fixes can be contributed into JDK's libjpeg that would be 
useful
2d-dev is the place ..

-phil.
>> Note that also Gentoo's jpeg is not
>> totally vanilla, it contains a few patches coming from Debian, and a
>> security fix to keep a large allocation of memory from killing the
>> system. If the additional stuff might be of help, and wouldn't break
>> software written with vanilla jpeg in mind, it might as well be
>> possible to backport those changes in Gentoo's jpeg library.
>