sample: add new Alpha sample with glibc-.13

Sample provided by Ioannis E. VENETIS

Reported-by: "Ioannis E. Venetis" <venetis@mail.capsl.udel.edu>
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}"

}