vsftpd: Backwards compatibility with USE_vsftpd_config flag
vsftpd: Backwards compatibility with USE_vsftpd_config flag

Provide backwards compatibility with the now deprecated USE_vsftpd_config
flag.  This flag will not be supported in OE-lite/base 4, and BSP's should
therefore switch to the new method of providing vsftpd-config instead.

Signed-off-by: Esben Haabendal <c5ba3f1141bb30a64dd6c7e6726a53a85adc9442@prevas.dk>

jacobbarsoe/rpi-base,jacobbarsoe/rpi-base,oe-lite-rpi/base,oe-lite-rpi/base