Overview of changes between 1.18.1 and 1.18.2
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- Require libthai >= 0.1.9 for enabling thai-lang module
- Misc bug fixes
- Bugs fixed in this release:
	Bug 474708 – pangocairo leaks memory
	Bug 472891 – Bad consistency check in pango_get_log_attrs
		Patch from Mathias Hasselmann
	Bug 302952 – The placement of a diacritic marks for an arabic ligature
		is not correct
	Bug 410152 – testboundaries test fails