Remove unused variable warning when OpenMP is disable
Remove unused variable warning when OpenMP is disable

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