allow building on Python 2.6
allow building on Python 2.6

GaZ3ll3/numba,IntelLabs/numba,ssarangi/numba,IntelLabs/numba,jriehl/numba,GaZ3ll3/numba,cpcloud/numba,gdementen/numba,pombredanne/numba,pombredanne/numba,numba/numba,sklam/numba,gmarkall/numba,stuartarchibald/numba,gdementen/numba,cpcloud/numba,ssarangi/numba,numba/numba,stefanseefeld/numba,pitrou/numba,pombredanne/numba,GaZ3ll3/numba,jriehl/numba,jriehl/numba,pitrou/numba,ssarangi/numba,numba/numba,pombredanne/numba,stonebig/numba,pitrou/numba,pombredanne/numba,sklam/numba,sklam/numba,jriehl/numba,gdementen/numba,jriehl/numba,sklam/numba,cpcloud/numba,stuartarchibald/numba,stonebig/numba,gmarkall/numba,stuartarchibald/numba,GaZ3ll3/numba,gmarkall/numba,cpcloud/numba,stonebig/numba,seibert/numba,numba/numba,IntelLabs/numba,seibert/numba,cpcloud/numba,pitrou/numba,GaZ3ll3/numba,ssarangi/numba,stefanseefeld/numba,gdementen/numba,pitrou/numba,gmarkall/numba,shiquanwang/numba,sklam/numba,stefanseefeld/numba,seibert/numba,shiquanwang/numba,stefanseefeld/numba,seibert/numba,gdementen/numba,ssarangi/numba,stefanseefeld/numba,IntelLabs/numba,shiquanwang/numba,numba/numba,stonebig/numba,seibert/numba,stuartarchibald/numba,gmarkall/numba,stuartarchibald/numba,stonebig/numba,IntelLabs/numba