Add new package [http://www.asterisk.org/ asterisk] (refs #706)

BIG-FAT-WARNING:
 * work in progress, not suitable for production use
 * the package just compiles, no menuconfig, no file is copied to the image, etc.
 * don't update to the revision if you're using some other asterisk patch
 * compile-tested with uClibc-0.9.33 only


git-svn-id: file:///var/svn/freetz/trunk@10611 149334a1-2f27-0410-a3b9-fc62619ac1e6