Only copy libffmpegsumo if build_libffmpegsumo is 1.
Only copy libffmpegsumo if build_libffmpegsumo is 1.

BUG=none
TEST=Build with build_libffmpegsumo=0 in ~/.gyp/include.gypi. Build should give no errors.

Review URL: http://codereview.chromium.org/2839006

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@49991 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser