Small semantic fix in ct.ng(.in): use make builtin variable to know the make-script name.

/trunk/ct-ng.in | 10 6 4 0 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

 # Compute x86_64-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }