[FFmpeg-cvslog] Merge commit 'b7c8a1fbbd0b6ac0b096ef0402dee440ff27ecb7' into release/2.4

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michaelni at gmx.at> | Sun Mar 29 03:28:56 2015 +0200| [51b0d7675c3419717d13e769096b93b0245b45f8] | committer: Michael Niedermayer

Merge commit 'b7c8a1fbbd0b6ac0b096ef0402dee440ff27ecb7' into release/2.4

* commit 'b7c8a1fbbd0b6ac0b096ef0402dee440ff27ecb7':
  webp: ensure that each transform is only used once

See: c089e720c1b753790c746a13053636d7facf6bf0
Merged-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=51b0d7675c3419717d13e769096b93b0245b45f8
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