Imported Upstream version 5.1.9 into tizen

Change-Id: I68f6b51063d39f2c94cd9e42968033dc60f2508d

diff --cc gif2rgb.c
Simple merge

diff --cc gifbg.c
Simple merge

diff --cc gifbuild.c
Simple merge

diff --cc gifclrmp.c
Simple merge

diff --cc gifcolor.c
Simple merge

diff --cc gifecho.c
Simple merge

diff --cc giffix.c
Simple merge

diff --cc gifhisto.c
Simple merge

diff --cc gifinto.c
Simple merge

diff --cc giftext.c
Simple merge

diff --cc gifwedge.c
Simple merge