./configure: enable user to specify path to some tools

/trunk/configure | 203 107 96 0 +++++++++++++++++++++++++++++++++-----------------------------
1 file changed, 107 insertions(+), 96 deletions(-)

# Compute IA-64-specific values

CT_DoArchTupleValues() {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}"

}