ports/devel/icu: PTHREAD_LIBS clean

[Norikatsu Shigemura]

On Wed, 29 Nov 2006 10:52:22 -0500
Mikhail Teterin <mi+kde at aldan.algebra.com> wrote:
> I know. And the ICU developers think, threads should be enabled by default. 
> The reason they aren't right now -- in the FreeBSD port -- is because of 
> certain bugs in thread implementation(s) on FreeBSD/ia64, which lead to 
> crashes in ICU.
> Since nothing is using ICU in a multi-threaded fashion _right now_, the 
> current version of the port builds without threads by default. Norikatsu 
> confirms, he is not calling into ICU from multiple threads either, hence my 
> suggestion, he does not need to change the option.

	I just hope to respect PTHREAD_LIBS.  But if you hope no thread
	feature, I don't use thread feature and test it.