./configure: fix the tools pattern recognition
- when a variable name was given, with no regexp, the pattern did not correctly extract the variable name

/trunk/configure | 11 8 3 0 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

 # Compute Alpha-specific values

 CT_DoArchTupleValues () {

     # The architecture part of the tuple:

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

     # The kernel ARCH:

     CT_KERNEL_ARCH=${CT_ARCH}

 }