[PATCH] Allow usage of external zlib copy

[Diego 'Flameeyes' Pettenò]

Most distributions have policies about using external copies of
libraries whenever possible. OpenJDK ships with a series of libraries
that are usually available on a system, like zlib and jpeg, thus
breaking such a policy.

The attached patch tries to correct part of this by letting use of
external zlib copy when passing EXTERNAL_ZLIB=true at the make process.

I'm also gonna work on a similar patch to use external jpeg library
(that will likely depend on this one because of some of the files
touched being the same).

-- 
Diego "Flameeyes" Pettenò
http://farragut.flameeyes.is-a-geek.org/
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