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>

 # Compute IA-64-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}${target_endian_el}"

     # Override CFLAGS for endianness:

     case "${CT_ARCH_BE},${CT_ARCH_LE}" in

         y,) CT_ARCH_ENDIAN_CFLAG="-EB";;

         ,y) CT_ARCH_ENDIAN_CFLAG="-EL";;

     esac

 }