Build debug version of the cbc.exe

Change-Id: Iaa1478bee87ca0038edb609b3212fc45d73f5918
Reviewed-on: http://review.couchbase.org/24422
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>