hg: jdk-updates/jdk11u: 8230597: Update GIFlib library to the 5.2.1

[matthias.baesken at sap.com]

Changeset: ac6ef7c537f7
Author:    serb
Date:      2019-12-02 16:38 -0800
URL:       https://hg.openjdk.java.net/jdk-updates/jdk11u/rev/ac6ef7c537f7

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