scripts/internals: fix stripping once more

Some scripts have 'very long lines', so the output of 'file'
will have that mentioned, such as:
POSIX shell script, ASCII text executable, with very long lines

Reported-by: Kyle Grieb <grieb.kyle@gmail.com>
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}"

 }