move mariadb to libs section

Change-Id: Ie78ea961a32e96c90bb674766b24a0c44d27412c
add an external for bluez_bluetooth_headers

Change-Id: Idf48f9a5c2245f6696688a17a0fa3809ae751582
there is no need for the condition

Change-Id: Icf3e0fbafdff39e5ad9c8eb7699820e2c0204bd6
this must be in lowercase letters

Change-Id: I58e4824156b1646d000a39ba196068efbe10425e