Allow using a system-installed giflib

[Omair Majid]

Hi,

Updated webrev at:
http://cr.openjdk.java.net/~omajid/webrevs/system-giflib/01/

The webrev borrows some idioms that Andrew Hughes pointed out, and uses
system headers for giflib too.

I checked this by building --with-libgif=system and also by removing the
src/share/native/sun/awt/giflib dir and using --with-giflib=system.

On 03/08/2013 12:26 PM, Phil Race wrote:
> If I understand correctly, this removes the directory containing
> the JDK's copy of giflib sources from the set of locations to be
> compiled etc, and replaces it with just a link line pointer to use
> "libgif" which is then expected to be on the default linker path,
> ie in /usr/lib.
> 
> I think this is fine except I would guard USE_EXTERNAL_LIBGIF
> with an expectation that this is at least "not" windows, since
> I'm pretty sure that option would always be a mistake there.

The updated webrev does that. I don't have a windows machine to test
this on, unfortunately.

Any comments or suggestions?

Thanks,
Omair

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