[proaudio] mixxx-9999 patch update.

[Alex Barker]

Simple patch update for the current live ebuild.  Offsets change.

--- mixxx-9999/src/SConscript
+++ mixxx-9999/src/SConscript
@@ -290,7 +290,6 @@
                 env.Alias('install', controllermappings)
                 env.Alias('install', translations)
                 env.Alias('install', keyboardmappings)
-                env.Alias('install', docs)
                 env.Alias('install', dotdesktop)
                 env.Alias('install', icon)
                 env.Alias('install', promotracks)