hg: jdk-updates/jdk13u-dev: 8230597: Update GIFlib library to the 5.2.1

[yan at azul.com]

Changeset: fc5659b24c8f
Author:    serb
Date:      2019-12-02 16:38 -0800
URL:       https://hg.openjdk.java.net/jdk-updates/jdk13u-dev/rev/fc5659b24c8f

8230597: Update GIFlib library to the 5.2.1
Reviewed-by: prr, psadhukhan, jdv

! src/java.desktop/share/legal/giflib.md
! src/java.desktop/share/native/libsplashscreen/giflib/dgif_lib.c
! src/java.desktop/share/native/libsplashscreen/giflib/gif_err.c
! src/java.desktop/share/native/libsplashscreen/giflib/gif_hash.h
! src/java.desktop/share/native/libsplashscreen/giflib/gif_lib.h
! src/java.desktop/share/native/libsplashscreen/giflib/gif_lib_private.h
! src/java.desktop/share/native/libsplashscreen/giflib/gifalloc.c
! src/java.desktop/share/native/libsplashscreen/giflib/openbsd-reallocarray.c