move third_party/gif deps to codec_srcs

SkCodec is built as its own cc_library and is missing
these sources.  We've been getting away with it because
:skia is still built with alwayslink=1.

(After this CL, I think it need not be built with alwayslink=1
anymore.  We used to use SkTRegistry to hook in codecs, but
we only use that registration trick in tools now.)

Change-Id: I79dbfc0080a438ecf1ee00e532ff40cd6f45d5b3
Reviewed-on: https://skia-review.googlesource.com/c/169140
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed