Fix warnings: boost static assert typedefs locally defined but not used.
Fix warning: variable set but not used.
add BOOST_LIBS as boost_system is required with --as-needed
Merge branch 'master' of git.sv.gnu.org:/srv/git/gnash
Fix warnings: deprecated {get,reget,release}_buffer in ffmpeg 2.0.
Fix warnings: comparison between signed and unsigned integer expressions.
distcheck: disable device=all and jemalloc on non-linux archs.