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

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

 reporter_name="Ioannis E. VENETIS"

 reporter_url="http://sourceware.org/ml/crossgcc/2008-06/msg00017.html"

 reporter_comment=""