Log Message:
Update textproc/icu to 2.6.  This is a major reference release with new
features and new and modified APIs from version 2.4:

* Added support for Unicode 4.0
* Added support for Unicode regular expressions
* Enhanced sorting
* Added support for international domain names
* Added service registration for pluggable ICU modules
* Added layout engine API for language-specific glyphs
* Separated currencies from locales
* Added POSIX-like API for message catalogs
* Added new charset converters