New joyride build 1770

[Build Announcer v2]

http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build1770

Changes in build 1770 from build: 1765

Size delta: 0.00M

-Pippy 19
+Pippy 20

--- Changes for Pippy 20 from 19 ---
  + Give a friendly error message if the audio library isn't found.
  + Look for the audio library in /home as well as /usr/share.
  + Collaboration: joining a shared Pippy gets you the owner's source buffer.

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