add Ubuntu 12.04 LTS, and build test at raspbian
add canadian cross 'mingw-w64'
fix typo. x86-64 to x86_64
fix typo. x86-64 to x86_64
fix typo x86-64 to x86_64
fix typo. add back slash
add mips mingw-w64-i686. x86_64 not work
support mingw-w64-x86_64