libyajl-dev isn't needed for now, because yaji have builtin libyajl
libyajl-dev isn't needed for now, because yaji have builtin libyajl

It solves problems with installing proper version on macos. yajl-ruby does the
same thing [1].

[1]: https://github.com/brianmario/yajl-ruby/tree/master/ext/yajl

Change-Id: I373842b6a0c03608e459ba02c01b40e7a30f49f5
Reviewed-on: http://review.couchbase.org/9351
Reviewed-by: Matt Ingenthron <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@couchbase.com>
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

dewolfe/couchbase-ruby-client,dewolfe/couchbase-ruby-client