Update GIFLIB to 5.0.4

bug:9557383

Requires external/skia change:
https://googleplex-android-review.googlesource.com/#/c/324745/

Change-Id: I0e59747b084c3215c699ada0edc0abd195e22e73
Merge tag 'tags/android-4.4_r1' into kitkat-staging

Android 4.4 Release 1.0