use --as-needed just on linux, since *bsd way is broken... (patch from Diego Pettenò <flameeyes@gentoo.org>) 
use --as-needed just on linux, since *bsd way is broken... (patch from Diego Pettenò <flameeyes@gentoo.org>) 

git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@6759 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg