Fix compilation for boost >= 1.50
Fix compilation for boost >= 1.50

artas360/pythran,hainm/pythran,serge-sans-paille/pythran,hainm/pythran,pbrunet/pythran,artas360/pythran,pbrunet/pythran,serge-sans-paille/pythran,pombredanne/pythran,pbrunet/pythran,pombredanne/pythran,hainm/pythran,artas360/pythran,pombredanne/pythran