package/pure-ftpd: Add uploadscript option
Enable option to compile with '--with-uploadscript' to allow running
script after successful uploads.
Signed-off-by: Sam Voss <sam.voss@rockwellcollins.com>
Acked-by: Bryce Ferguson <bryce.ferguson@rockwellcollins.com
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>