scripts/functions: only use passive FTP

Virtually all FTP server available on-line support passive FTP.
At least, this is the case for the servers crosstool-NG needs to
connect to.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

reporter_name="Bart vdr. Meulen <bartvdrmeulen@gmail.com>"

reporter_url=""

reporter_comment="Config to build cross-compiler with mingw as kernel type"