[PATCHes] Allow using system's copies of libjpeg, libpng and giflib for splashscreen

[Diego 'Flameeyes' Pettenò]

Trying to make OpenJDK more friendly for those distributions (like
Gentoo and Debian iirc) having in their policy the use, whenever
possible, of the system's libraries rather than internal copies of
them, I've prepared three patches to AWT's libsplashscreen that allows
to use the external/system copy of the three libraries in the subject.

The default behaviour is unchanged, you need to pass EXTERNAL_JPEG
EXTERNAL_LIBPNG and EXTERNAL_GIFLIB with the value "true" to get them
used.

Hope this helps,
-- 
Diego "Flameeyes" Pettenò
http://farragut.flameeyes.is-a-geek.org/
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