Guard against unavailable expm1 in py26
Guard against unavailable expm1 in py26

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