[Bug 95073] [sync request] sync libthai 0.1.8-2 from debian experimental

[Alexander Sack]

Public bug reported:

0.1.8-2 is needed for firefox thai support. So please update current
feisty version to that one.

All needed dependencies are in ubuntu main

** Affects: libthai (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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[sync request] sync libthai 0.1.8-2 from debian experimental
https://launchpad.net/bugs/95073