Bug#761978: mixxx: fix mips64el build

[YunQiang Su]

Package: mixxx
Version: 1.11.0~dfsg-3

Please add
'mips64', 'mips64el', 'mipsn32', 'mipsn32el',
to debian/patches/1001-buildsystem.patch

I tested it on mips64el. It works well.


-- 
YunQiang Su