Fix SCons whitespace issue (tabs/spaces)

Mixxx 2.2.1

Mixxx 2.1.8

Mixxx 2.1.7

Mixxx 2.1.6

Mixxx 2.2.0 release

Mixxx 2.1.5

Mixxx 2.1.4

release Mixxx 2.1.3

This is the replacement tag, for the original releas-2.1.2 tag

accidentally pointing the master branch. If you don´t see
the original tag on this commit, please call
git tag -d release-2.1.2
git fetch upstream
to fix this