scrips/functions: fix downloads using curl

By default curl doesn't folow redirects. This breaks sourceforge downloads.
Add the -L option to curl to fix this.

Curl also downloads the html as a file even when it gets a 404. This breaks
http downloads when using the failback system. Add the -f option to curl to fix
this.

Signed-off-by: Richard Strand <richard.strand@icomera.com>

 #!/bin/sh

 SKIP_ME="### CT_NG SKIP ME ###"

 skip_me=$(($(cat "${0}" |@@grep@@ --binary-files=text -o -b -E "^${SKIP_ME}$" |cut -d : -f 1)+${#SKIP_ME}+1))

 dd if="${0}" bs=${skip_me} skip=1 2>/dev/null |bzcat

 exit 0

 ### CT_NG SKIP ME ###