added with-oci and with-mariadb to build QtSql with Oracle DB and with mariadb

added --with-oci to compile QtSql with Oracle db engine
added --with-mariadb to have possibility to build qt5 using installed mariadb (--with-mysql wants to remove mariadb and install mysql)
Hmm if there is a command which can check if mysql/mariadb/precona formula is installed i'll be happy to!