samples: . accepts previous comment as-is

When updating a sample configuration with a comment, a dot '.'
in the new comment keeps the previous comment.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.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

 }