RFR: 8328999: Update GIFlib to 5.2.2

[Phil Race]

On Fri, 26 Apr 2024 21:37:56 GMT, Alisen Chung <achung at openjdk.org> wrote:

> Updating giflib, clientlibs tests are green on all platforms

This giflib update has huge amount of gratuitous reformatting make it hard to spot what is really new.
I hope they don't repeat that.

src/java.desktop/share/native/libsplashscreen/giflib/gif_hash.h line 40:

> 38: #include <unistd.h>
> 39: #endif
> 40: /** End JDK modifications to support building on Windows **/

Do we still need this ?

src/java.desktop/share/native/libsplashscreen/giflib/gif_lib.h line 57:

> 55: #define true 1
> 56: /** End JDK modifications to support building using old compilers**/
> 57: 

Do we still need this ?

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PR Comment: https://git.openjdk.org/jdk/pull/18985#issuecomment-2080172718
PR Review Comment: https://git.openjdk.org/jdk/pull/18985#discussion_r1581575163
PR Review Comment: https://git.openjdk.org/jdk/pull/18985#discussion_r1581574254