Updated some depricated function calls of ffmpeg to current ones.


git-svn-id: svn+ssh://svn.code.sf.net/p/elmerfem/code/trunk@6534 04224531-1f84-46d8-96ce-875b9e37dce3
Reverted some errorness change in Makefile.in


git-svn-id: svn+ssh://svn.code.sf.net/p/elmerfem/code/trunk@6535 04224531-1f84-46d8-96ce-875b9e37dce3
Added const keywords to eio

git-svn-id: svn+ssh://svn.code.sf.net/p/elmerfem/code/trunk@6536 04224531-1f84-46d8-96ce-875b9e37dce3