RFR: 8328999: Update GIFlib to 5.2.2

[Alisen Chung]

On Mon, 29 Apr 2024 21:05:34 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

>> 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 ?
>
> The GIFLIB version 5.2.2 adds the `ifndef` wrap, and it is no longer the "JDK modification", so it looks like our comment can be removed

does this also apply for the other JDK modification for old compilers as well?

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/18985#discussion_r1585334886