misc: change references to point to the new website

It's been a while now that crosstool-NG has been hosted on it's own
website, and not at my home. Change every reference to the old site
to the new one, everywhere is makes sense to.

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

 # Compute sparc-specific values

 CT_DoArchTupleValues() {

     # That's the only thing to override

     if [ "${CT_ARCH_64}" = "y" ]; then

         CT_TARGET_ARCH="${CT_ARCH}64"

     fi

 }