talkback package so that the installer doesn't generate a nasty -214 DOES_NOT_EXIST error if/when the Talkback client fails to be built and included in the installer properly. Bug 258625, attachment 173352. Patch by Jeff Walden. r=chase@mozilla.org, a=asa@mozilla.org/chase@mozilla.org git-svn-id: svn://10.0.0.236/trunk@174155 18797224-902f-48f8-a5cc-f745e15eee43