(Only the first 10 of 11 ports in this commit are shown above. )
Add asterisk15 port, bringing branch 15 of the asterisk project.
Note that branch 15 is NOT a Long Term Support branch. Asterisk 15
will reach EOL before Asterisk 13.
Requested by: "Herbert J. Skuhra" <herbert@gojira.at> (thanks for
help testing)