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 Alpha-specific values

CT_DoArchTupleValues () {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}${CT_ARCH_ALPHA_VARIANT}"

}