Makefile.linux: update
Makefile.linux: use same locations as for scripts/get_aubio.sh, scripts/get_deps*
Makefile.linux: add path to both amd64 and i686 binaries
Makefile.linux: set default to sdk 2.5
Makefile.linux: move libvamp-sdk.a to end of line
Makefile: splitted for osx/linux/mingw32