[PATCH] Add libdispatch

[ng0]

libdispatch:
I think that the compiler can only find libblocks-runtime on a bsd system and 
that the port can not run tests.
This is my theory, I must put it to practice, the new nvidia-texture-tools(?) 
required libdispatch which is why I packaged this.
This was before the current version got released, I assume it's still required.

[PATCH 1/4] gnu: Add libkque.
[PATCH 2/4] gnu: Add libpthread_workqueue.
[PATCH 3/4] gnu: Add libblocks-runtime.
[PATCH 4/4] gnu: Add libdispatch.