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)
Yep, but the build should fail with proper message (it's nasty, but 99% of stuff which uses the oracle stuff depends on this env variable.

P.S.:
We can create the formula for it and just depend on it,.